Spinel

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Spinel
Spinel2.jpg
Spinel. 4.13ct and 1.83ct.
General
Category Oxide minerals
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 minerals. It haes the formula MgAl2O4.[1] Balas ruby is an auld name for a rose-tintit variety.

References[eedit | eedit soorce]