General Information:
Chemical Formula:
(K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38
Composition:
(Molecular Weight = 1,682.56 gm)
Potassium 1.39 % K
Strontium 0.52 % Sr
Calcium 0.71 % Ca
Magnesium 0.72 % Mg
Titanium 36.99 % Ti
Chromium 18.54 % Cr
Iron 4.98 % Fe
Oxygen 36.13 % O
Empirical Formula:
K0.6Ca0.3Sr0.1Ti13Cr6Fe2+1.5Mg0.5O38
Environment:
In kimberlite.
IMA Status:
Approved IMA 1983
Locality:
Jagersfontein mine, Orange Free State, South Africa.
Name Origin:
Named for Frances Celia Morna Mathias (1913-), British-South African geochemist, University of Capetown, South Africa.
Physical Properties:
Cleavage:
None
Color:
black.
Density:
4.6
Diaphaniety:
Opaque
Hardness:
7.5 - Garnet
Luster:
Metallic
Streak:
gray
More details...