General Information:
Chemical Formula:
Ba10Ca2Mn++TiSi10O30(OH,Cl,F)10
Composition:
(Molecular Weight = 2,526.04 gm)
Barium 54.36 % Ba
Calcium 3.17 % Ca
Titanium 1.90 % Ti
Manganese 2.17 % Mn
Silicon 11.12 % Si
Hydrogen 0.28 % H
Chlorine 2.81 % Cl
Oxygen 23.44 % O
Fluorine 0.75 % F
Empirical Formula:
Ba10Ca2Mn2+TiSi10O30(OH)7Cl2F
IMA Status:
Approved IMA 1965
Locality:
Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California.
Name Origin:
Named for John Muir (1838-1914), American geologist and explorer who made early observations in geology in the Sierra Nevada Mountains, California, USA.
Physical Properties:
Cleavage:
[001] Indistinct, [100] Indistinct
Color:
orange or brown.
Density:
3.86
Habits:
Anhedral Grains - Granular minerals without the expression of crystal shapes, ,
Hardness:
2.5 - Finger Nail
Luster:
Vitreous (Glassy)
Streak:
light orange
More details...