apphire Is A Precious Gemstone, A Variety Of The Mineral Corundum, Consisting Of Aluminum Oxide (Α-Al2O3) With Trace Amounts Of Elements Such As Iron, Titanium, Chromium, Vanadium, Or Magnesium. It Is Typically Blue, But Natural “Fancy” Sapphires Also Occur In Yellow, Purple, Orange, And Green Colors;
This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation).
Diamond
A clear octahedral stone protrudes from a black rock.
The slightly misshapen octahedral shape of this rough diamond crystal in matrix is typical of the mineral. Its lustrous faces also indicate that this crystal is from a primary deposit.
General
Category Native minerals
Formula
(repeating unit) C
Strunz classification 1.CB.10a
Dana classification 1.3.6.1
Crystal system Cubic
Crystal class Hexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space group Fd3m (No. 227)
Structure
Jmol (3D) Interactive image
Identification
Formula mass 12.01 g/mol
Color Typically yellow, brown, or gray to colorless. Less often blue, green, black, translucent white, pink, violet, orange, purple, and red.
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