mineral

Hypersthene

Enstatite-Ferrosilite series, (Mg,Fe)2Si2O6

Hardness: 5.5-6 on Mohs scale. Color: Dark brown, brownish-black, greyish black, or greenish black with a distinctive iridescent bronze-like or pearly sheen (schiller effect). Luster: Vitreous to sub-metallic, resinous. Crystal Structure: Orthorhombic. Cleavage: Good in two directions.

Hardness: 5
Luster: Vitreous to sub-metallic, resinous

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic and ultramafic igneous rocks such as gabbro, norite, and basalt, as well as in high-grade metamorphic rocks and stone-iron meteorites.

Uses & applications

Used primarily as a gemstone, polished into cabochons or beads for jewelry, and as a decorative or healing crystal specimen for collectors.

Geological facts

The name Hypersthene is derived from the Greek words 'hyper' meaning 'above' and 'sthenos' meaning 'power' or 'strength', referring to its higher hardness compared to hornblende. It exhibits a famous silky schiller effect caused by micro-inclusions.

Field identification & locations

Identified by its dark, almost black color combined with a velvety, metallic sheen or schiller when tilted under bright light. Found commonly in Canada (Labrador), USA, Greenland, Norway, and Australia.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

sedimentary

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock