PREHNITE

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Stalactitic Green Prehnite Cluster
Size (inches): 4 x 2 x 2.75
Weight (grams): 94
Price: (US) $ 10.00
Shipping: $ 5.00
ID: DPR08
Location: Dindoshi, Malad, Mumbai
Large Cabinet Specimen

Chemistry: Phyllosilicate of calcium and aluminum with the formula: Ca₂Al(AlSi₃O₁₀)(OH)₂. Limited Fe³⁺
Color: usually a pale green to a yellowish grass green, also gray, white or colorless, Gray, Yellow, Yellow green, White.
Luster: Vitreous to waxy or pearly.
Transparency: Transparent to mostly translucent.
Crystal System: orthorhombic.
Crystal Habits: Stalactitic - Shaped like pendant columns as
stalactites or stalagmites.

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Prehnite was named after its discoverer; Colonel Hendrik von Prehn and is an attractive collection mineral that is occasionally used for ornamental stone purposes. Its color is usually a pleasant green and is at times quite unique to prehnite. Typical prehnite forms rather thick crusts with a rough or crystalline texture. Epimorphs (crystal growth over the surface of another mineral) over laumontite crystals are interesting and attractive. Usually the Laumontite has dissolved away leaving the hollow crust of prehnite behind.
source: http://mineral.galleries.com/minerals/silicate/prehnite/prehnite.htm