General Information:
Chemical Formula:
[ ](Na,K)Fe++Fe+++[Si6O15]
Composition:
(Molecular Weight = 546.41 gm)
Potassium 1.43 % K
Sodium 3.37 % Na
Iron 20.44 % Fe
Silicon 30.84 % Si
Oxygen 43.92 % O
Empirical Formula:
Na0.8K0.2Fe2+Fe3+Si6O15
Environment:
In volcanic rock.
Locality:
Mayor (Tuhua) Island, Bay of Plenty (Opo Bay), Norht Island, New Zealand.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[100] Good, [010] Good, [001] Good
Color:
blue violet, dark blue, or black.
Density:
2.89
Hardness:
3-4 - Calcite-Fluorite
Streak:
reddish gray
More details...