Apophyllite, Stilbite and other Zeolites
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Item #1ZE10141050
Stilbite Sheafs from Aurangabad, India

$21.00
Zeolite Specimen from the 2014 M.A.G.M.A. Gem
& Mineral Show in Hiddenite, North Carolina.
Stilbite Sheafs from Aurangabad, India
This specimen weighs 4.5oz, or 0.29 lb (132 g)
and measures
3.2 x 3.1 x 1.4 inches  (8.1 x 7.8 x 3.6cm)
Heat water and you'll see steam rise as it comes to a boil. You can get the same thing to happen if you heat a unique
rock called a Zeolite, which traps water inside itself.  In 1756 a Swedish Geologist named Axel Cronstedt (1722–
1765…best known as the discoverer of nickel), observed this unique characteristic and gave these rocks the name
"Zeolite".  The name comes from the Greek words (zéō), meaning "to boil" and (líthos), meaning "stone".  












"Zeolite-ZSM-5-3D-vdW". Licensed under Public domain via Wikimedia Commons -
http://commons.wikimedia.org/wiki/File:Zeolite-ZSM-5-3D-vdW.png#mediaviewer/File:Zeolite-ZSM-5-3D-vdW.png

We need to understand the physical make up to explain what unique features Zeolites have. Zeolites are micro porous
crystalline solids with well-defined structures. They will normally contain silicon, aluminum and oxygen in their solid
structure and cations*, water and other molecules in their open pores. *(An ion is an atom or group of atoms in which the
number of electrons is not equal to the number of protons, giving it a net positive or negative electrical charge. An anion
is an ion that is negatively charged, and is attracted to the anode or the positive electrode in electrolysis. A cation has a
net positive charge, and is attracted to the cathode or the negative electrode during electrolysis.) Many occur naturally
as minerals, and are extensively mined in many parts of the world. Others are man-made synthetics, and are made
commercially for specific uses.

Because of their unique porous properties, zeolites are used in a variety of applications and are often referred to as
molecular sieves.  Some of the major uses of Zeolites are in petrochemical cracking (the process whereby complex
organic molecules such as kerogens or heavy hydrocarbons are broken down into simpler molecules), ion-exchange
(water softening and purification), and in the separation and removal of gases and solvents.
Zeolites are stable solids that resist environmental conditions that degrade many other materials. They are not affected
by high pressures or temperatures, they don't burn, they will not dissolve in water or inorganic solvents, and they will not
oxidize in the air. They're not believed to cause any health problems or harm the environment. Zeolites stable and
unreactive nature is not what makes them so useful.

The unique thing about zeolites is their ability to trap other molecules inside their micro porous crystalline structure which
is a cage-like or framed type of structure. This is how water molecules and alkali or alkaline-Earth metal ions
(sometimes called cations) become a part of zeolite crystals.  Zeolites can trade other positively charged ions for the
metal ions originally trapped inside them. This is known as cation exchange and as Cronstedt found over 250 years
ago; they can gain or lose their water molecules very easily too (this is known as reversible dehydration). Zeolites have
fixed sizes of openings in them which let small molecules pass through but trap larger ones, acting as molecular sieves.
Natural Zeolites occur in random forms and mixed sizes. Man-made Zeolites are manufactured to a specific  size to trap
molecules of a certain (smaller) size inside them.

Zeolites help to provide a cleaner, safer environment. Most uses of Zeolites are the result of efforts to meet
environmental concerns by reducing toxic waste and energy consumption.  Zeolites have replaced harmful phosphate
builders in laundry detergent. Phosphate builders have been banned in many parts of the world because of water
pollution potential risks. Zeolites are also used as catalysts which make chemical processes more efficient, saving
energy and reducing pollution, waste and by-products. Zeolites can also be used as solid acids which reduce the need
for corrosive liquid acids. Zeolites can also be used as redox (reduction and oxidation electron exchange processes,
reduction is the gain of electrons, oxidation is the loss of electrons) catalysts and sorbents that can remove atmospheric
pollutants, such as engine exhaust gases and ozone-depleting CFCs. Zeolites can also be used to remove harmful
organics and heavy metal ions such as those produced during nuclear fission from water.
Analcime family:
Analcime
Pollucite
Wairakite
Bellbergite
Bikitaite
Boggsite
Brewsterite
Chabazite family:
Chabazite
Willhendersonite
Cowlesite
Dachiardite
Edingtonite
Epistilbite
Erionite
Faujasite
Ferrierite
Gismondine family:
Amicite
Garronite
Gismondine
Gobbinsite
Gmelinite
Gonnardite
Goosecreekite
Harmotome family:
Harmotome
Phillipsite
Wellsite
Heulandite family:
Clinoptilolite
Heulandite
Laumontite
Levyne
Mazzite
Merlinoite
Montesommaite
Mordenite
Natrolite family:
Mesolite
Natrolite
Scolecite
Offretite
Paranatrolite
Paulingite
Perlialite
Stilbite family:
Barrerite
Stilbite
Stellerite
Thomsonite
Tschernichite
Yugawaralite
Minerals In The Zeolites Group of 7 Families
Zeolites are a beautiful group of rare and complex crystal minerals for collectors. These are naturally formed in the
cavities (vesicles) of volcanic rocks. Zeolites are Metamorphic Rocks.  Some Zeolites form with subtle amounts of heat
and pressure, marginally being called metamorphic, while others are found in classic metamorphic formations. Some
of the most popular collectible Zeolites come from the Deccan Traps in India. There are 7 families of Zeolites as shown
here. Some minerals  such as Apophyllite and Okenite, are not Zeolites but are often found in combination with
Zeolites, and sometimes erroneously referred to as Zeolites
Item #4ZE10144050
Peach Stilbite from Jalgaon, India

$21.00
Zeolite Specimen from the 2014 M.A.G.M.A.
Gem & Mineral Show in Hiddenite, North
Carolina. Peach Stilbite from Jalgaon, India

This specimen weighs 5oz, or 0.31 lb (142 g)
and measures
3.2 x 2.6 x 1.5 inches  (8.2 x 6.7 x 4 cm)
Item #6ZE10146050
Stilbite from Aurangabad, India

$21.00
Zeolite Specimen from the 2014 M.A.G.M.A. Gem
& Mineral Show in Hiddenite, North Carolina.
Stilbite from Aurangabad, India
This specimen weighs 6oz, or 0.37 lb (171 g)
and measures
3.3 x 2.7 x 1.1 inches  (8.5 x 7 x 2.8 cm)
Item #7ZE10147050
Rare Stilbite Plates on Chalcedony
from Jalgaon, India

$39.00
Zeolite Specimen from the 2014 M.A.G.M.A.
Gem & Mineral Show in Hiddenite, North
Carolina. Rare Stilbite Plates on Chalcedony
from Jalgaon, India
This specimen weighs 5.5oz, or 0.34 lb (157 g)
and measures
3.9 x 2.6 x 1.6 inches  (10 x 6.6 x 4.2 cm)
Item #8ZE10148050
Peach Stilbite Sheafs from Jalgaon,
India

$27.00
Zeolite Specimen from the 2014 M.A.G.M.A. Gem
& Mineral Show in Hiddenite, North Carolina.
Peach Stilbite Sheafs from Jalgaon, India
This specimen weighs 10.1oz, or 0.63 lb (287g)
and measures
3.7 x 3.3 x 2.4 inches  (9.6 x 8.4 x 6.2 cm)
M.A.G.M.A.
Mountain Area Gem and Mineral Association
Item #10ZE101410050
Stilbite from Jalgaon, India

$19.00
Zeolite Specimen from the 2014 M.A.G.M.A. Gem &
Mineral Show in Hiddenite, North Carolina. Stilbite
from Jalgaon, India
This specimen weighs 5.3oz, or 0.33 lb (153 g)
and measures
3.2 x 2.5 x 1.4 inches  (8.2 x 6.5 x 3.7cm)
Item #11ZE101411050
Apophyllite and Peach Stilbite from
Jalgaon, India

$25.00
Zeolite Specimen from the 2014 M.A.G.M.A.
Gem & Mineral Show in Hiddenite, North
Carolina. Apophyllite and Peach Stilbite from
Jalgaon, India
This specimen weighs 8.1oz, or 0.51 lb (231 g)
and measures
3.7 x 2.4 x 1.7 inches  (9.4 x 6.2 x 4.4 cm)
Apophyllite specimens are found in ancient lava and basalt flows. The crystals grow in the now solid
cavities, called amygdules or vesicles, formed by air bubbles when the rock was molten. Apophyllite is
also found in the voids in the contact metamorphic zone limestones that surround intrusive rocks. What
makes apophyllite so popular among collectors is its fantastic crystals with their gem-like vitreous to
pearly luster. Apophyllite almost always forms good crystals of two major types. The favorite crystal
habit is the rectangular prism capped by a steep four sided pyramid (tetragonal dipyramid). By far its
most impressive color is the pastel green color that augments specimens from Poona, India. Some
crystals of apophyllite are cut as gems, but mostly just for collectors.
The other common crystal habit is a pseudo-cubic crystal that occurs when there is no pyramid and the
prism is ended by a flat termination (a pinacoid). The pinacoid is a crystal form that is perpendicular to
the length of the crystal and so can abruptly terminate the prism.
Apophyllite, whose name roughly means "to leaf apart" in Greek, is a mineral classic. It was given its
name because crystals tend to peel or flake apart when they are heated due to the loss of water
molecules. Although not that well-known by the general public, apophyllite is quite popular among
mineral collectors. It is probably the first exotic mineral that a young collector will own after filling up on
specimens of calcite, quartz, pyrite, galena, mica, fluorite, gypsum, apatite, etc, etc. After these
common minerals, apophyllite seems like a real rarity and it offers so much to the collector. It has
beauty, pastel colors, a bright luster and interesting well formed habits.
Stilbite is a common and perhaps the most popular zeolite mineral for collectors. Stilbite crystals can
aggregate together to form a structure resembling wheat sheafs. This hourglass structure looks like
several crystals stacked parallel to each other with the tops and bottoms of this structure fanning out while
the middle remains thin. Stilbite's hallmark crystal habit is unique to stilbite and a rarer but related zeolite
called stellerite. Stilbite is a striking specimen with its pearly luster and often colorful pink tints. Stilbite
commonly forms nice crystals inside the petrified bubbles (called vesicles) of volcanic rocks that have
undergone a small amount of metamorphism.
Stilbite
Apophyllite
Item #CSZE09168585
Chabazite Crystals with Stellerite
from the Sokolovskiy Mine,
Kazakhstan

$125.00
Zeolite Specimen from the 2008 Tucson Gem & Mineral
Show
in Arizona. Very rare specimen of Chabazite with
Stellerite from a highly sought after location.
This specimen weighs 2.2oz, or 0.13 lb (62.5g)
and measures 2.7 x 1.8 x 0.9 inches  (6.8 x 4.6 x 2.3cm)
Item # 12ZE11129441
Spectacular White Chalcedony Stalactite and
Stilbite Crystal Cluster from Jalgaon

$39.00
Incredible Off White Chalcedony Stalactites Host
Double Terminated, Super Glassy Stilbite Crystals.
This piece has an excellent 2" (50mm) long Double
Terminated  Bow Tie Stilbite crystal and shows
multiple tubular stalactite formations with small
Chalcedony Quartz starburst crystals as the base
for the Stilbite. A one of a kind specimen!
This specimen measures
5.1 x 3.8 x 2.5 inches (13 x 9.7 x 6.5cm) and weighs 16.3
oz or 1.02 lbs (464g).
Item #14ZE09171060
Large Cabinet Peach Stilbite Sheafs from
Aurangabad, India

$37.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Light Peach Stilbite Sheafs
from Aurangabad, India
This specimen weighs 53.6oz, or 3.35 lb (1.52kg)
and measures 6.8 x 4.9 x 3.4" (17.2 x 12.6 x 8.8cm)
Item #15ZE09172060
Large Cabinet Peach Stilbite Sheafs from
Aurangabad, India

$30.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Peach Stilbite Sheafs from
Aurangabad, India
This specimen weighs 18.4oz, or 1.14 lb (517g)
and measures 4.6 x 3.6 x 2.2" (11.7 x 9.1 x 5.7cm)
Item #30ZE09173060
Large Cabinet Green Apophyllite and
white Stilbite from Ahmednagar, India

$79.00
Zeolite Specimen from the July 2017 Franklin NC Gem & Mineral Show. Green Apophyllite Crystal
Cluster with minor white Stilbite on Basalt Matrix.
This specimen weighs 21.3oz, or 1.33 lb (604g) and measures 4.8 x 3.4 x 2.3" (12.2 x 8.7 x 5.9cm)
Item #31ZE09174060
Large Cabinet Clear Quartz Crystals from
Jalgaon, India

$34.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Clear Quartz Crystals from
Jalgaon
This specimen weighs 51.9oz, or 3.24 lb (1.47kg)
and measures 4.9 x 4.4 x 2.7" (12.6 x 11.2 x 6.9cm)
Item #42ZE09175060
Large Cabinet Clear Apophyllite Crystals with
Calcite from Nasik, India

$30.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Clear Apophyllite Crystals
with Calcite blocks on Basalt matrix from Nasik
This specimen weighs 29.2oz, or 1.82 lb (828g)
and measures 5.4 x 4.1 x 1.8" (13.7 x 10.6 x 4.7cm)
Item #43ZE09176060
Calcite on Chalcedony from Jalgaon,
India

$39.00
Zeolite Specimen from the July 2017 Franklin NC Gem & Mineral Show. Milky Calcite on Chalcedony from
Jalgaon, India
This specimen weighs 10.4oz, or 0.65 lb (297 g) and measures 3.7 x 3.4 x 2.3 inches  (9.4 x 8.8 x 5.8cm)
Item #45ZE09178060
Clear Apophyllite Crystals with Heulandite on
Basalt matrix from Jalgaon, India

$20.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Clear Apophyllite Crystals
with Heulandite on Basalt matrix from Jalgaon
This specimen weighs 4oz, or 0.25 lb (116g)
and measures 3.2 x 1.8 x 1.6" (8.3 x 4.7 x 4.2cm)
Item #44ZE09177060
Cavansite on matrix from Pune, India

$15.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Cavansite on matrix from
Pune
This specimen weighs 2.2oz, or 0.13 lb (63.5g)
and measures 2.3 x 1.4 x 1.3" (5.9 x 3.5 x 3.3cm)
Item #46ZE09179060
Goosecreekite from Jalgaon, India

$15.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Goosecreekite from
Jalgaon.
This specimen weighs 2.4oz, or 0.15 lb (70g)
and measures 1.9 x 1.7 x 1.3" (4.9 x 4.3 x 3.4cm)
Item #47ZE09170160
Calcite Cube from Nasik, India

$15.00
Zeolite Specimen from the July 2017 Franklin NC
Gem & Mineral Show. Calcite from Nasik.
This specimen weighs 1.9oz, or 0.12 lb (55g)
and measures 2.1 x 0.97 x 0.79" (5.4 x 2.4 x 2cm)