Hypersthene | Gemopedia

Hypersthene is a common mineral in the pyroxene group that rarely forms distinct crystals. Its name is from a Greek word meaning "over strength," referring to its hardness. It is usually brown, green or gray with vitreous to pearly luster and displays a brilliant coppery metallic surface sheen.
Alternate
Names
Enstatite, Ferroan Enstatite,
Colors
Bronze, Gray, Black, Whitish, Brown, Green

Hypersthene Classification

Common Name

Hypersthene

Species

Enstatite

Variety

Colors

Bronze, Gray, Black, Whitish, Brown, Green

Alternate Names

Enstatite, Ferroan Enstatite,

Gemstone Groups

Pyroxene

Key Separations

RI, birefringence, optic character and spectrum

Comments

Misnomer: Hypersthene has been discredited by the CNMMN Pyroxene Subcommitee in 1988 and it is used as a synonym for enstatite or ferrosilite.

Hypersthene Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.673-1.731

Birefringence

0.01-0.016

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert
LWUV: inert

CCF Reaction

Pleochroism

Dichroic, strong bluish-green and brownish-red

Dispersion

Strength: weak fire

Comments

Hypersthene Chemistry & Crystallography

Chemical Name

magnesium iron silicate

Chemical Formula

(Mg,Fe)2Si2O6

Synthesis

Crystal System

Orthorhombic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Hypersthene Characteristic Physical Properties

Hardness

5-6

Streak

White Or Gray

Specific Gravity

3.4-3.5 Typical:3.45

Toughness

Poor

Inclusions

Hypersthene displays a copper red schiller or sheen caused by tabular inclusions of hematite and goethite.

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Good, in one direction

Comments

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