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 Home / Gem Library / Natural Gemstones / Prehnite May 29, 2023  

Natural Prehnite
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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.

Known Facts
Color Key: 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

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.

Prehnite Prehnite
Check our Top, Largest, Smallest or Latest Prehnite's.

Prehnite Stats/
Popularity Index: 27288hits
Total Items: 4items
Total Weight: CTS 62.59
Cheapest: USD 26.10
Most Expensive: USD 53.76
Largest: CTS 4.99
Smallest: CTS 2.61
Last Added: 10/19/12 10:18:32

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