Dogtooth Calcite
SpiritRock Shop
4.95 lb Brown Dogtooth Calcite
Excellent large cabinet display specimen of well defined and sharp Scalenohedral (dogtooth) high luster light brown
calcite crystals is from a locale in the Santa Eulalia Mining District, Mun de Aquiles, Serdan, Chihuahua, Mexico. This
specimen could be the centerpiece of your display. It has very spiky calcite specimen-pointed dogtooth crystals all
over. The crystals are highly lustrous and very flashy with a light dusting of clear calcite crystals.

This specimen weighs 79.2 oz or 4.95 lbs (2245g) and measures 6.1 x 5.2 x 3.6 inches ( 15.5 x 13.4 x 9.3cm)
Click on any photo to see a larger version
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Museum Specimens
Dogtooth Calcite is a variety of Calcite that forms as multiple scalenohedral crystals. Dogtooth Calcite is
often referred to as Dog-toothed Spar. (Spar is a general term for transparent to translucent, generally
light-colored and vitreous crystalline minerals.) Dogtooth Calcite is an unusual variety of calcite and is
named "Dogtooth" because the stone itself looks like a large collection of dogs teeth. It has some
standard colorings from clear through golden, white, grey, tan, brown and purple to name a few, but also
is found some rarer shades.

Dogtooth Calcite is often found in caves as a speleothem growing out of limestone. These caves often
have standing water that is seasonal or undisturbed for many years to allow these unique formations to
grow. Dogtooth calcite crystals are not limited to caves, but can grow in any open space including veins,
fractures, and geodes.

The sharply tooth-shaped crystals typically consist of acute scalenohedrons, twelve triangular crystal faces
that ideally form scalene triangles. (In a scalene triangle, all sides and all angles are unequal. An example
is a right triangle, but scalene triangles are not always right triangles.) However, modification of these
faces is common, and individual crystal faces may have many more than three edges.

Our favorite Dogtooth Calcite specimens come from the Mines in the Santa Eulalia District, Chihuahua,
Mexico. The stunning tans, browns, purples and "snow coatings" are fascinating
Item # DTC03113425
4.95 lb Light Brown
Dogtooth Calcite from
Chihuahua Mexico

Item # DTC08109352
1950's Old Stock Brown
Dogtooth Calcite with
White Calcite

1950's Old Stock Brown Dogtooth Calcites with secondary clear to white
Calcite overgrowth and inter-growth. A variation like this is ofter referred to
as a two color Calcite specimen, an older piece as this type has not been
common in recent finds. This specimen is from Santa Eulalia, Chihuahua,
Mexico and was obtained from the 1950's "Mineral Museum" in
Follansbee, West Virginia

This specimen weighs 1 lb (461g)
and measures 4.1 x 3.8 x 2inches (10.6 x 9.7 x 5.3cm)
Item # DTC11101145
Rare 7.94 lb Tower of Dogtooth Star
Calcite Balls with Selenite

Rare 7.94 lb Tower of Dogtooth Star Calcite Balls with Selenite
This specimen is a very rare find!
We procured it from a supplier who personally goes to the mines in Chihuahua Mexico daily and hand picks only the best
and rarest finds from the mines. He kept this one packed away for a few years because he had never seen another one
like this. We finally got this beauty and have listed it for your pleasure.

Excellent Free Standing Display Piece!
This piece is about 4.8 inches (12.2cm) in diameter and stands about 6.5 inches (16.5cm) tall. This unique piece has
diametrical growth color variations from the interior (top right photo)and exterior macroscopic properties much like star
quartz balls or spirit quartz type look. Research on the crystal formations left us at a loss for a definitive name for the
pattern so we elect to call it "Dogtooth Star Calcite Balls" The formation has many very sharp dogtooth calcite crystals in
the star ball formations. There is a sprinkling of white selenite that is similar to the "Calcite of the Stars" listed above.

There is one star ball that was broken during the removal of this specimen from the mine. The last two photos show this
damage. Inspection of this piece shows no other damage outside normal removal breakaway. We debated about even
selling this piece...don't know if we will ever see another like it...but...we can't keep everything. The price?....Set by
may be worth many times that amount. It's hard to set value on "One of a Kind" specimens...oh yes, when you handle this
piece please wear leather gloves...the dogtooth "really bites you" on this one...Sharp Points!  
Item # DTC03168684
Rare Dark Coffee Brown
Dogtooth with Clear and White
Calcite "Snow and Ice" coating

Rare Dark Coffee Brown Dogtooth Calcite
This rare specimen is from our Personal collection, These crystals are formed
beautifully and are outlined with clear and white calcite giving the appearance
of being coated with snow and ice. This piece almost looks black. This is an
incredible Calcite formation with some larger points!
This specimen weighs 25.2 oz or 1.57 lbs (718g)
and measures 5.1 x 4.7 x 2.2 inches (13 x 11.9 x 5.7 cm)
Item # DTC03167004
Rare Purple Dogtooth  
Calcite Points from
Santa Eulalia, Mexico

Rare Purple Dogtooth  Calcite Points from Santa Eulalia, Mexico
This is a beautiful purple dogtooth calcite from the San Jose mine, Santa Eulalia district.  
The deep purple color comes from the growth of fluorite mixing into the brown calcite.
This specimen weighs10 oz or 0.62 lbs (284g)
and measures 3.8 x 3 x 1.9 inches (9.8 x 7.7 x 4.9 cm)
Item # DTCNM03160001
Rare Dogtooth Calcite on Pyrite Matrix
from SW New Mexico

This is very old, rare and unusual find is from
a rather remote area in New Mexico. This
specimen of Dogtooth Calcite on a Pyrite
matrix from our personal collection was found
in the Peloncillo (Little Baldy) Mountains,
Hidalgo County, in the SW corner of New
Mexico in an area known as the “Bootheel”.
The southern border of this area is shared
between the Mexican States of Chihuahua
and Sonora while the eastern border is the
Mexican State of Chihuahua. The western
border is the State of Arizona.

This piece weighs 5.8 oz or 0.36 lb (165g)
and measures  3.1 x 2.2 x 1.3 inches
(8 x 5.6 x 3.2 cm)
This is an outstanding large cabinet specimen of Selenite Crystals on well defined, sharp
Scalenohedral Dogtooth Calcite crystals from the Buena Tierra mine, Santa Eulalia District,
Aquiles Serdan, Mexico. There is one spot where some of the dogtooth crystals broke off, probably
due to something in the cave falling on the formation many years ago, and Selenite has started to
form over the damaged area. This does not distract from the beauty of this specimen. This unique
piece has diametrical growth color variations from the interior that are visible when viewed from the
bottom. This is a great piece to display or add to a collection. This specimen from our personal
collection was extracted by hand in 2009. Specimens are no longer coming out of this mine, the
pocket has been exhausted.

This specimen weighs 27.4 oz or 1.71 lbs (779g)
and measures 5.1 x 4.5 x 2.2 inches (13.1 x 11.5 x 5.6 cm)
Item # DTC01169985
Selenite Crystals on
Dogtooth Calcite