General Information:
Chemical Formula:
CaMn++Mn++2Fe+++2(PO4)4(OH)2·8(H2O)
Composition:
(Molecular Weight = 874.61 gm)
Calcium 4.58 % Ca
Manganese 18.84 % Mn
Iron 12.77 % Fe
Phosphorus 14.17 % P
Hydrogen 2.07 % H
Oxygen 47.56 % O
Empirical Formula:
CaMn2+Mn2+2Fe3+2(PO4)4(OH)2·8(H2O)
IMA Status:
Approved IMA
Locality:
Mangualde pegmatite, Beira, Portugal.
Name Origin:
Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.
Physical Properties:
Cleavage:
None
Color:
brownish yellow.
Density:
2.78
Diaphaniety:
Transparent
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
More details...