Spinel
| Spinel | |
|---|---|
Spinel. 4.13ct and 1.83ct.
|
|
| General | |
| Category | Oxide meenerals Spinel group Spinel structural group |
| Formula (repeating unit) |
MgAl2O4 |
| Strunz classification | 04.BB.05 |
| Identification | |
| Color | Various; reid tae blue tae mauve, dark green, broun, black |
| Crystal habit | Cubic, octahedral |
| Crystal seestem | Isometric |
| Cleavage | Indistinct |
| Fractur | Conchoidal, uneven |
| Mohs scale hairdness | 7.5–8.0 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent tae translucent |
| Specific gravity | 3.6–4.1 |
| Optical properties | Isotropic |
| Refractive index | 1.719 |
| Pleochroism | Absent |
| Solubility | none |
| Ither characteristics | Nonmagnetic, non-radioactive, sometimes fluorescent (reid) |
| References | [1][2] |
Spinel /ˈspɪnɛl/ is the magnesium aluminium member o the lairger spinel group o meenerals. It haes the formula MgAl2O4.[1] Balas ruby is an auld name for a rose-tintit variety.
