Spinel /ˈspɪnɛl/ is the magnesium aluminium member o the braider spinel group o minerall.
It haes the formula MgAl2O4. It wis kent i the bygane ruby ballas, miskent as bein sae like wae rubies an wis muckle socht efter for tae mak jowlry an ither sic plaister.
Spinel | |
---|---|
Spinel. 4.13ct and 1.83ct. | |
General | |
Category | Oxide meenerals Spinel group Spinel structural group |
Formula (repeatin unit) | MgAl2O4 |
Strunz clessification | 04.BB.05 |
Creestal seestem | Isometric |
Identification | |
Colour | Various; reid tae blue tae mauve, dark green, broun, black |
Creestal habit | Cubic, octahedral |
Cleavage | Indistinct |
Fractur | Conchoidal, uneven |
Mohs scale haurdness | 7.5–8.0 |
Skinkle | Vitreous |
Streak | White |
Diaphaneity | Transparent tae translucent |
Speceefic gravity | 3.6–4.1 |
Optical properties | Isotropic |
Refractive index | 1.719 |
Pleochroism | Absent |
Solubility | none |
Ither chairacteristics | Nonmagnetic, non-radioactive, sometimes fluorescent (reid) |
References |
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