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Museum Specimens
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Thumbnail Specimens
Most rock and mineral collectors don’t think about how or where they will display their prized specimen pieces.
Everyone loves an amazing display specimen.  However…just where do you plan on displaying your specimens
and how much room do you actually have for your displays? These should be questions most rockhounds and
collectors ask. Your specimen size is very important. Large crystals and large mineral specimens can be wonderful
and impressive. Everyone who has ever been stopped in their tracks by an exquisite large specimen on display in
a rock and mineral show or museum wants some “killer” large specimens. But how does that relate to your mineral
collection? If you are starting or building a mineral collection, you need to consider the sizes of your specimens.

Larger mineral specimens are generally lower quality than smaller comparable ones. This is basically due to the
fact that larger specimens have more formation issues such as cloudiness, fractures, less defined precise edges,
etc.  They are more difficult to extract from their matrix and to get to the end collector without being damaged during
mining or shipping.  This also accounts for the significantly higher price for those rarer large specimens that are
more perfect.

If a mineral specimen is something you just have to have, it surely is something special enough to display.  It takes
no time to run out of display spaces for your specimens and that happens a lot faster with larger specimens.  If you
live in a small house, your collection that began as something exciting can quickly become overwhelming.  Many
collectors have beautiful collections, but they wind up keeping their collections boxed up and stored away because
they have no place to show it off.  After all the arduous hours collecting and the hard earned money we have spent
on our specimens, they wind up somewhere we can’t enjoy them and neither can anyone else.

Many collectors have a plan for the future, when they will turn a room, the basement or garage into a mineral display
room; or build an addition on the house; or move to a larger house that will have space for the collection.  Guess
what …your mineral collection is now running your life choices!  No one who begins collecting rocks and minerals
ever thinks that someday their hobby will dictate to them to build more space or move to a larger house.
Think about how you plan to enjoy and share your rocks and minerals. Will you be viewing your collection in a
display cabinet from a distance or will you view it in a cabinet or on shelving close-up? Some collectors keep their
specimens in drawer cabinets where the specimens are only visible when the drawer is opened. You can get glass
top display cases in a variety of sizes to show off your collection.

We believe the ideal collection will include a variety of rock and mineral specimen sizes.  If the collector is aware of
sizes and display space available, you can build an exceptional collection.  You could plan on using some shelving
and a small display cabinet for most of the collection and also have a few larger exceptional specimens on your
current cabinets or tables.

Although there are a few terms commonly used for mineral sizes, the exact dimension of these sizes differs,
depending on the source. The “AFMS” (American Federation of Mineralogical Societies) rules, which are used in
U.S. mineral show competitions, have a specified set of dimensions. Mineral dealers and collectors commonly use
slight variations. The variations that exist occur mainly due to availability of display boxes or plastic cubes to
display specimens in. We are not suggesting that you must use any specific dimensions for the terms; we just want
you to be aware of the terminology and approximate common dimension for each size.
Guide to Mineral Sizes
(MM) - Micro mineral
- a small (typically less than 1") piece of matrix with micro crystals unmounted.  The                
term "micro mineral" depends more on the size of the crystals or specific mineral than it does on the size of the
matrix. Requires magnification to identify or evaluate.
(MT)  Micro mount - a mounted micro specimen, usually in a standard "micro mount" size box (Dimensions: 1.0" x
1.0" x 0.75" (2.54 cm x 2.54 cm x 1.90 cm).  The matrix, where present, is typically 3/8 inch or less in maximum
dimension.  Some micro mounts may consist of a single crystal mounted with no matrix.  
(TN) Thumbnail - fits in a standard “Perky" box dimensions 1.25" x 1.25" x 1.25" (3 cm cube).                                    
(MN)  Miniature – specimen size ranging from about 1.5 inches to about 2.5 inches across maximum dimension.   
Fits in a 2” (5 cm) cube
(SC)  Small cabinet - 2.5 to 4 inches (6 to 10 cm) across maximum dimensions.                                                           
(LC)  Large Cabinet – 4 to 6 inches (10 to 15 cm) across maximum dimension.                                                           
(MUSEUM)  Museum (or Extra-Large Cabinet)- more than 6 inches (15 cm) across maximum dimension. These
extra-large specimens are commonly referred to as museum…not to designate quality, but only to designate size.
XL or XLS cannot be used as XL / XLS are the mining abbreviations for crystal / crystals

These size classifications are not universal.  Different mineral dealers may have slightly different dimension
standards for what they consider to be miniature, small cabinet, large cabinet and museum or extra-large cabinet.  
The dimensions for Thumbnail and Micro mount sized minerals are fairly standard because the standard display
boxes limit their size.

Many of our customers have requested thumbnail specimens from us, so we are now creating this Thumbnail
Specimens page where we will list thumbnail specimens. They will be in random order and like items grouped
together whenever possible. You talk, we listen! Happy Thumbnail hunting!
1TMB08160010
Sweet Home Mine
Rhodochrosite Crystal
$10.00
This crystal measures 4.8 x 3.8 x 1.7mm.
Specimen is set on mineral tack
It is from the Sweet Home Mine (Home
Sweet Home Mine), Mount Bross, Alma
District, Park Co., Colorado
2TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada
Specimen is set on mineral tack
3TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada
Specimen is set on mineral tack
4TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada
Specimen is set on mineral tack
5TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada
Specimen is set on mineral tack
6TMB11150004
Glacial Concretion
$8.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada
Specimen is set on mineral tack
7TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada
Specimen is set on mineral tack
8TMB11150004
Aragonite from Morocco
$10.00
Aragonite Crystal Cluster from the
Safro Mine in
Bou Azzer Morocco.
9TMB11150004
Aragonite from Morocco
$10.00
Aragonite Crystal Cluster from the
Safro Mine in
Bou Azzer Morocco.
10TMB11150004
Aragonite from Morocco
$10.00
Aragonite Crystal Cluster from the
Safro Mine in
Bou Azzer Morocco.
11TMB11150004
Aragonite from Morocco
$10.00
Aragonite Crystal Cluster from the
Safro Mine in
Bou Azzer Morocco.
12TMB11150004
Aragonite from Morocco
$10.00
Aragonite Crystal Cluster from the
Safro Mine in
Bou Azzer Morocco.
13TMB11150004
Aragonite from Morocco
$10.00
Aragonite Crystal Cluster from the
Safro Mine in
Bou Azzer Morocco.
14TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$12.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
15TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$12.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
16TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$10.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection (has
depression mark from Parallel crystal)
17TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$13.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
18TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$12.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
19TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$10.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
20TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$14.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
21TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$12.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
22TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$12.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
23TMB11150004
Quartz Polished Point with
Actinolite and Chlorite Inclusions
$12.00
Jewelry Grade Polished Quartz Point
with Actinolite and Chlorite Inclusions
from Madagascar 2004 Collection
24TMB11150004
Quartz with Golden Rutile
$18.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
25TMB11150004
Quartz with Golden Rutile
$15.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
26TMB11150004
Quartz with Golden and
Red Rutile
$20.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
27TMB11150004
Quartz with Golden Rutile
$15.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
28TMB11150004
Quartz with Golden Rutile
$15.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
29TMB11150004
Quartz with Golden Rutile
$20.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
30TMB11150004
Quartz with Golden Rutile
$14.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
31TMB11150004
Quartz with Golden Rutile
$14.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
32TMB11150004
Quartz with Golden Rutile
$14.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
33TMB11150004
Quartz with Golden Rutile
$12.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
34TMB11150004
Quartz with Golden Rutile
$10.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
35TMB11150004
Quartz with Golden Rutile
$20.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
36TMB11150004
Quartz with Golden Rutile
$8.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
37TMB11150004
Quartz with Golden Rutile
$14.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
38TMB111500043
Quartz with Golden Rutile
$10.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
39TMB11150004
Quartz with Golden Rutile
$10.00
Polished Quartz with Golden Rutile
Inclusions from Brazil 1960's Collection
40TMB11150004
Tri-Flow Obsidian
$10.00
Tri-Flow Obsidian from Utah
41TMB11150004
Celestine
$10.00
Celestine twinned crystal from
Jaen, Spain
42TMB11150004
Bismuth Crystal
$10.00
Bismuth Crystal grown in the USA!
43TMB11150004
Montana Agate
$10.00
2 Polished specimens of Montana
Agate
44TMB11150004
Eudialyte
$10.00
Eudialite from Magnet Cove, Arkansas
45TMB11150004
Calcite
$8.00
Calcite with orange vein from Mexico
46TMB11150004
Crazy Lace Agate
$10.00
Crazy Lace Agate with drusy Quartz
from Mexico
47TMB11150004
Smoky Quartz Polished Point
$20.00
Smoky Quartz Polished Point from
2004 Madagascar collection
48TMB11150004
Cuprite on Copper
$12.00
Old Stock Cuprite on Copper from
Ray, Arizona
49TMB11150004
Amethyst
$20.00
Amethyst XLS (Crystals) from
Guerrero, Mexico
Old Stock
50TMB11150004
Opal Fluorite
$20.00
Opalized Fluorite "Tiffany Stone" from
the Brush-Wellman Mines in the
Topaz-Spor Mountains of Juab
County's Sevier Desert, in Western
Utah.
51TMB11150004
Pyromorphite
$39.00
Rare Old Stock Pyrmorphite from the
Russell Tunnel in Burke, Idaho. This
specimen is glued to the foam
52TMB11150004
Dioptase
$24.00
Dioptase XLS (Crystals) on Quartz
from Namibia, Africa
53TMB11150004
Rhodochrosite
$25.00
Rhodochrosite from the American
Tunnel in Overton, Colorado
54TMB11150004
Brookite
$39.00
Rare Brookite XLS (Crystals) from
Magnet Cove, Arkansas.
This Old Stock specimen is glued on a
toothpick glued to the foam
55TMB11150004
Fluorite
$45.00
Specular Fluorite from Churchill
County, Nevada
56TMB11150004
Autunite & Torbernite
$49.00
This rare specimen is an old stock
collection piece. The specimen is
from Mitchell County, North
Carolina
Autunite is one of the more
attractive and popular radioactive
minerals.Torbernite is a popular
mineral among collectors who seek
uranium bearing minerals.
Specimen is glued to foam
Click on any photo to see larger picture                Specimens are set on Mineral Tack unless stated otherwise
57TMB11150004
Calcite Crystals
$10.00
Golden Calcite Crystals from Brazil
58TMB11150004
Dogtooth Calcite with
Hematite Phantoms
$12.00
Scalenohedral (Dogtooth) Calcite with
red hematite phantoms
(commonly called Mariposa Calcite or
Butterfly Calcite)
59TMB11150004
Bismuth Crystal
$10.00
Bismuth Crystal lab grown in the USA
60TMB11150004
Bismuth Crystal
$10.00
Bismuth Crystal lab grown in the USA
61TMB11150004
Bismuth Crystal
$10.00
Bismuth Crystal lab grown in the USA
62TMB11150004
Bismuth Crystal
$10.00
Bismuth Crystal lab grown in the USA
63TMB11150004
Bismuth Crystal
$10.00
Bismuth Crystal lab grown in the USA
64TMB11150004
Mica Crystals
$20.00
Rare Muscovite Mica
Crystals from Hiddenite,
Alexander County, NC
82TMB11150006
Bismuth Crystal
$12.00
Old Stock Bismuth Crystal lab grown in
West Germany
83TMB11150006
Bismuth Crystal
$12.00
Old Stock Bismuth Crystal lab grown in
West Germany
65TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
66TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
67TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
68TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
69TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
70TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
71TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
72TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
73TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
74TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
75TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
76TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
77TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
78TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
79TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
80TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack
81TMB11150004
Glacial Concretion
$10.00
Glacial Concretion from the Harricana
River, Abitibi, Quebec, Canada.
Specimen is set on mineral tack