Properties
| Category | Oxide mineral |
|---|---|
| Formula | Cu2O |
| Crystal system | Cubic |
| Color | Dark red to cochineal red, sometimes almost black |
| Crystal habit | Cubic, octahedral, and dodecahedral crystals; as hairlike capillary forms, earthy, compact granular and massive |
| Cleavage | Fair in four directions forming octahedrons |
| Fracture | Conchoidal to uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 3.5 to 4 |
| Luster | Adamantine, sub-metallic, earthy |
| Streak | Shining metallic brownish-red |
| Diaphaneity | Transparent, translucent |
| Specific gravity | 6.14 |
From the Wikipedia article
Cuprite is an oxide mineral composed of copper(I) oxide Cu2O, and is a minor ore of copper.
Source
Source record: crystal-compendium/cuprite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Cuprite — revision id 1255393289. Text and properties from Wikipedia, licensed CC BY-SA 4.0.