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21 cts. ... Prehnite Cabochon ... 20 x 15 x 8  MM

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. PREHINITE CABOCHON

Prehnite was named after its discoverer; Colonel Hendrik von Prehn and is an attractive collection mineral that is occassionally 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 crystaline 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.

PHYSICAL CHARACTERISTICS:
•Color is usually a pale green to a yellowish grass green, also gray, white or colorless.
•Luster is vitreous to waxy or pearly.
•Transparency: Crystals are transparent to mostly translucent.
•Crystal System is orthorhombic; 2 m m.
•Crystal Habits include nodular, concretionary, radial, encrusting and stalactitic formations among other similar types. Tabular or pyramidal individual crystals are rare but some nodular specimens show tabular crystal protrusions. Epimorphs (crystal growth over the surface of another mineral) over laumontite are usual, but available (see above).
•Cleavage is good in one direction (pinacoidal).
•Fracture is uneven.
•Hardness is 6 - 6.5.
•Specific Gravity is approximately 2.9+ (average).

21 cts. ... Prehnite Cabochon ... 20 x 15 x 8 MM


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