Hypersthene

Hypersthene is an iron-rich pyroxene in the same series of minerals as enstatite and bronzite. It is distinguished by its reddish iridescence, which is due to platy inclusions of goethite and hematite. Often too dark to facet, it may be cut en cabochon instead to show the sparkling inclusions. The colors of hypersthene may range from green to greyish black and brown.

Occurrence

Most gem-quality hypersthene is found in Norway, India, Germany, Greenland, and the USA.

Hypersthene Properties

• Specific Gravity: 3.35
• Refractive Index: 1.65-1.67
• Birefringence (DR): 0.010
• Luster: Vitreous
• Crystal Structure: Orthorhombic
• Composition: Iron magnesium silicate
• Hardness: 5½

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Birthstone

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