Hypersthene

Big Photo

Germany
8.98 carats
© Brian Kosnar - Mineral Classics

Hypersthene is named after Greek word for "over strength", alluding to its greater hardness than hornblende, a mineral with which it is often confused.

Well-developed crystals are rare, the mineral is usually found as foliated masses.

Colour is brown, green or grey and the luster is vitreous to pearly. Hypersthene displays a brilliant copper-red metallic sheen or schiller on certain surfaces.

Hypersthene Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Hypersthene Gemstones by Size

This table shows distribution of Hypersthene gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:8.98 cts
Heaviest:10.31 cts
Average:9.64 cts
Total photos:2
Do you have a larger Hypersthene? Why not upload a photo?
8.98ct to 9.11ct9.11ct to 9.25ct9.25ct to 9.38ct9.38ct to 9.51ct9.51ct to 9.65ct9.65ct to 9.78ct9.78ct to 9.91ct9.91ct to 10.04ct10.04ct to 10.18ct10.18ct to 10.31ct
General Information
Chemical Formula
(Fe,Mg)
 
2
Si
 
2
O
 
6
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Photos of natural/un-cut material from mindat.org

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Physical Properties of Hypersthene
Mohs Hardness5 to 6
Walter Schumann, Gemstones of the world (2001)
More from other references
Specific Gravity3.45 to 3.55
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Optical Properties of Hypersthene
Refractive Index1.673 to 1.731
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterBiaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Birefringence0.016
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
PleochroismGreen stones - strong: (dark) bluish-green - brownish-red - (yellowish)
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
Colour (General)Black, black-brown, black-green
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
TransparencyTransparent,Translucent,Opaque
Walter Schumann, Gemstones of the world (2001)
More from other references
Crystallography of Hypersthene
Crystal SystemOrthorhombic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Inclusions in Hypersthene
Tabular inclusions of hematite and goethite - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4
Further Information
Mineral information:Hypersthene information at mindat.org
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