General Information:
Chemical Formula:
MnMnMn2Fe+++2(PO4)4(OH)2·8(H2O)
Composition:
(Molecular Weight = 889.47 gm)
Manganese 24.71 % Mn
Iron 12.56 % Fe
Phosphorus 13.93 % P
Hydrogen 2.04 % H
Oxygen 46.77 % O
Empirical Formula:
Mn2+Mn2+Mn2+2Fe3+2(PO4)4(OH)2·8(H2O)
IMA Status:
Approved IMA
Locality:
Stewart mine, Pala, San Diego County, California, USA.
Name Origin:
Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.
Physical Properties:
Cleavage:
None
Color:
brown, purplish brown, yellow, or yellow orange.
Diaphaniety:
Transparent to Translucent
Hardness:
4 - Fluorite
Luster:
Vitreous - Adamantine
Streak:
white
More details...