Natural Prehnite

Prehnite is an orthorhombic mineral which is rarely found as distinct crystals. Found in association with volcanic rocks, it usually forms in aggregates with botryoidal habit. Prehnite is typically pale green to yellowish green with a white streak. It is named after a Dutchman, Colonel H. von Prehn, who discovered the mineral at the Cape of Good Hope, South Africa, and brought the first specimens to Europe.

Find your Prehnite

Our Prehnite(s) are available in various shapes, sizes and colors. 4 Prehnite(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Prehnite Profile

Color information:	yellow green, brown, yellow brown, oil green
Refractive Index:	1.61 - 1.64
Chemical Composition:	(CA2Al2SI3O10(OH)2)
Hardness:	6
Density:	2.80 - 2.95
Crystal Group:	Orthorhombic
Ocurrence:	China, France, U.S.A., Scotland, Australia
Sign of the Zodiac:	N/A
Month of the year:	N/A

Prehnite occurs most commonly in veins and cavities in igneous rocks, often in association with zeolites. Prehnite is never clean enough to produce bright faceted gemstones but beautiful yellow to blue green cabochons can be cut from the right material.

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