Properties
| Category | Inosilicate minerals (single chain) |
|---|---|
| Formula | (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 |
| Crystal system | Monoclinic |
| Color | Black, brown, greenish, violet-brown; in thin section, colorless to gray with zoning common |
| Crystal habit | Commonly as stubby prismatic crystals, also acicular, skeletal, dendritic |
| Cleavage | {110} good with 87° between {110} and {110}; parting on {100} and {010} |
| Fracture | uneven to conchoidal |
| Tenacity | brittle |
| Mohs scale hardness | 5.5 to 6 |
| Luster | Vitreous, resinous to dull |
| Streak | Greenish-white |
| Diaphaneity | Transparent to opaque |
| Specific gravity | 3.19–3.56 |
From the Wikipedia article
Augite, also known as Augurite, is a common rock-forming pyroxene mineral with formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. The crystals are monoclinic and prismatic. Augite has two prominent cleavages, meeting at angles near 90 degrees.
Source
Source record: crystal-compendium/augite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Augite — revision id 1369970091. Text and properties from Wikipedia, licensed CC BY-SA 4.0.