Properties
| Category | Oxide minerals |
|---|---|
| Formula | BeAl2O4 |
| Crystal system | Orthorhombic |
| Color | Various shades of green, emerald-green yellow, blue, brownish to greenish black, may be raspberry-red under incandescent light when chromian; colorless, pale shades of yellow, green, or red in transmitted light |
| Crystal habit | Crystals tabular or short prismatic, prominently striated |
| Cleavage | Distinct on {110}, imperfect on {010}, poor on {001} |
| Fracture | Conchoidal to uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 8.5 |
| Luster | Vitreous |
| Streak | White |
| Specific gravity | 3.5–3.84 |
From the Wikipedia article
The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula Be Al2O4. The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar". Despite the similarity of their names, chrysoberyl and beryl are two completely different gemstones, although they both contain beryllium, aluminium and oxygen. Chrysoberyl is the third-hardest frequently encountered natural gemstone and lies at 8.5 on the Mohs scale of mineral hardness, between corundum (9) and topaz (8).
Source
Source record: crystal-compendium/alexandrite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Chrysoberyl — revision id 1374719919. Text and properties from Wikipedia, licensed CC BY-SA 4.0.