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Mineralpedia Details for Scolecite

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Scolecite

Scolecite

Named for its worm-like behavior when heated, after the Greek word for “worm,” skolec. Many localities are known including exceptionally good crystals from Iceland, Scotland, Austria, Switzerland, India, the USA, Mexico, and Brazil. Scolecite is found in cavities in basalts, in gneiss and amphibole, and in syenitic and gabbroic magma-derived dikes and laccoliths. Scolecite is pyroelectric, produces a charge when heated, and piezoelectric, produces a charge in response to pressure, and can fluoresce a yellow or brown under short-and long-wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/scolecite.pdf

Formula
Ca(Si3Al2)O10·3H2
Crystal System
Monoclinic 
Crystal Habit
Massive - Fibrous, Radial 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
brownish, colorless, white 
Streak
white 
Class
Monoclinic - Domatic 
Fracture
Brittle - Uneven 
Hardness
5-5.5 
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Scolecite from New Era, Clackamas Co., Oregon, United States

Scolecite
            from New Era, Clackamas Co., Oregon, United States

Snow white sprays to 5mm in pocket lined with Thomsonite.

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Scolecite from Cape d'Or, Nova Scotia, Canada

Scolecite
            from Cape d'Or, Nova Scotia, Canada

An imperssive huge crystal of Scolecite.

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