General Information:
Chemical Formula:
(Fe++,Mn,Ca)3(PO4)2
Composition:
(Molecular Weight = 351.93 gm)
Calcium 3.42 % Ca
Manganese 14.05 % Mn
Iron 28.56 % Fe
Phosphorus 17.60 % P
Oxygen 36.37 % O
Empirical Formula:
Fe2+1.8Mn2+0.9Ca0.3(PO4)2
Name Origin:
Named after its locality at Grafton, New Hampshire, USA.
Physical Properties:
Cleavage:
[010] Perfect
Color:
brown, pink, dark brown, or reddish brown.
Density:
3.67 - 3.7, Average = 3.68
Diaphaniety:
Translucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Lamellar - Thin laminae producing a lamellar structure.,
Hardness:
5 - Apatite
Luminescence:
None.
Luster:
Vitreous - Greasy
Streak:
pale pink
More details...