Angelite
| Colour | Blue, Clear, Purple, White |
|---|---|
| Mohs hardness | 3.5 |
| Lustre | Pearly on {010} vitreous to greasy on {001} vitreous on {100} |
| Streak | White |
| Crystal system | Orthorhombic |
| Transparency | Transparent to translucent |
| Cleavage | [010] perfect [100] perfect [001] good, resulting in pseudocubic fragments |
| Fracture | Conchoidal |
| Chemical formula | CaSO 4 |
| Specific gravity | 2.97 |
What is Angelite?
Anhydrite, or anhydrous calcium sulfate, is a mineral with the chemical formula CaSO4. It is in the orthorhombic crystal system, with three directions of perfect cleavage parallel to the three planes of symmetry. It is not isomorphous with the orthorhombic barium (baryte) and strontium (celestine) sulfates, as might be expected from the chemical formulas. Distinctly developed crystals are somewhat rare, the mineral usually presenting the form of cleavage masses. The Mohs hardness is 3.5, and the specific gravity is 2.9. The color is white, sometimes greyish, bluish, or purple. On the best deve
How to identify Angelite
- Lustre: Pearly on {010} vitreous to greasy on {001} vitreous on {100}.
- Hardness: Mohs 3.5 — soft; a knife will scratch it.
- Streak: White.
- Habit: Orthorhombic crystal system.
Angelite in different forms
Stones often confused with Angelite
Frequently asked questions
How hard is Angelite?
Angelite is Mohs 3.5 on the hardness scale.
What colour is Angelite?
Angelite is typically blue, clear, purple, white (Colorless to pale blue or violet if transparent; white, mauve, rose, pale brown or gray from included impurities).