Enstatite

Physical Properties
Chemical formula Mg2Si2O4
Class Inosilicate
Double chains of linked tetrahedra
Crystal system Orthorhombic
Habit Massive
Blocky
Fibrous
Lamellar
Prismatic
Acicular
Color Grey, green
Hardness 5 to 6
Specific gravity 3.2 to 3.5
Cleavage Two perfect prismatic {210}
Fracture Uneven
Luster Vitreous, pearly
Transparency Translucent
Streak White, grey
Optical Properties
PPL Nearly colorless
May display varying strengths of pink
to green pleochroism
XPL 1st order colors
Parallel extinction
Straight, parallel lines
δ 0.008
after Perkins, 326-327

Enstatite In Hand Sample

Enstatite hand sample

Enstatite in peridotite from the Josephine ophiolite exposed in Josephine County, Oregon

Scanning electron micrograph of enstatite

Enstatite in Thin Section

Thin Section GigaPans

Enstatite in plane polars

Enstatite in crossed polars

Enstatite, PPL

Enstatite, XPL

Enstatite kodama

Further Reading

Enstatite at webmineral.com

Enstatite at mindat.org