What is Enstatite?
Enstatite is the magnesium-rich orthopyroxene end-member, common in mafic and ultramafic rocks and occasionally transparent enough for gems.
Mineralogy and structure
Reference formula: MgSiO3. Enstatite is an orthopyroxene with orthorhombic chains of silicate tetrahedra. Iron-rich compositions grade toward ferrosilite, while bronzite is a related intermediate material.
Colour and appearance
Typical colours include colourless, grey, green, brown, yellow-brown. The usual prismatic, granular, massive habit and vitreous, pearly lustre are useful descriptive features, but colour alone is not diagnostic.
Formation and localities
Enstatite forms in or is associated with magnesium-rich igneous rocks, granulites, peridotites and some meteorites. Important documented localities include Norway, Austria, South Africa, Myanmar, India, the United States and meteorite finds.
Collecting and care
Stable for display, though cleavage and fine lamellae can produce chips or a bronzy surface sheen.
Enstatite in popular symbolism
Modern crystal guides sometimes associate Enstatite with symbolic themes based on colour or collecting tradition. These associations are cultural interpretations, not mineralogical or medical properties.
