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Spiky Epistilbite Spray

The Mineral epistilbite




Epistilbite is a rare member of the zeolite group. It has a very similar chemical makeup to Stilbite, and can be difficult to distinguish from Stilbite. Epistilbite is named from the Greek Epi which means "similar" and Stilbite, due to the similarity of this mineral to Stilbite. Epistilbite is not dimorphous with Stilbite, despite its prefix Epi which often implies a dimorph. Interestingly, Epistilbite it dimorphous with a different zeolite, the rare Goosecreekite.

Chemical Formula CaAl2Si6O16 · 5(H2O)
Composition Hydrous calcium aluminum silicate
Color Colorless, white, cream, tan, light yellow, light brown, gray. Rarely orange, orange-red, or pink.
Streak Colorless
Hardness 4
Crystal System Triclinic
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Crystals are often prismatic, with distinct chisel-topped terminations. Also globular and in hemispherical, ball-like formations. Other habits in include thin, tabular crystals and groups, columnar, in radiating clusters, and in jagged, haphazard crystals.
Transparency Transparent to translucent
Specific Gravity 2.2 - 2.3
Luster Vitreous, pearly
Cleavage 1,1
Fracture Uneven
Tenacity Brittle
In Group Silicates; Tectosilicates; Zeolite Group
Striking Features Crystal habits and association with other zeolites.
Environment In air vesicles in volcanic basalt.
Rock Type Igneous
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 3


Epistilbite ON EBAY

POLYMORPHS
Goosecreekite



NOTEWORTHY LOCALITIES
Epistilbite is not a common member of the zeolite group, and good localities are few. Some of the largest crystals come from Berufjördur, Iceland, at Teigarhorn and Fossárfell. Sharp Epistilbite crystal group and aesthetic balls on matrix come from several localities in Maharashtra, India, most notably at Jalgaon, but also at Pune, Nasik, and Ahmadnagar. Small crystals with red inclusions come from Osilo, Sardinia, Italy. In the U.S., colorless micro crystals are found in the Puu o Ehu Quarry, Kailua, Oahu Island, Hawaii.

COMMON MINERAL ASSOCIATIONS
Quartz, Calcite, Heulandite, Mordenite, Stilbite, Apophyllite, Celadonite

DISTINGUISHING SIMILAR MINERALS
Stilbite - Different crystal formation.


epistilbite PHOTOS
 
ADDITIONAL RESOURCES
 
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