Spinel

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Spinel
Spinel2.jpg
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 [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.

References[eedit | eedit soorce]