Spinel

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Spinel
Spinel2.jpg
Spinel. 4.13ct and 1.83ct.
General
CategoryOxide meenerals
Spinel group
Spinel structural group
Formula
(repeatin unit)
MgAl2O4
Strunz clessification04.BB.05
Creestal seestemIsometric
Identification
ColourVarious; reid tae blue tae mauve, dark green, broun, black
Creestal habitCubic, octahedral
CleavageIndistinct
FracturConchoidal, uneven
Mohs scale haurdness7.5–8.0
SkinkleVitreous
StreakWhite
DiaphaneityTransparent tae translucent
Speceefic gravity3.6–4.1
Optical propertiesIsotropic
Refractive index1.719
PleochroismAbsent
Solubilitynone
Ither chairacteristicsNonmagnetic, non-radioactive, sometimes fluorescent (reid)
References[1][2]

Spinel /ˈspɪnɛl/ is the magnesium aluminium member o the braider spinel group o minerall. It haes the formula MgAl2O4.[1] 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.

References[eedit | eedit soorce]