General Information:
Chemical Formula:(Mn,Fe++,Mg,Ca)2(PO4)(F,OH)
Composition:(Molecular Weight = 211.64 gm)Calcium 3.79 %
CaMagnesium 3.45 %
MgManganese 25.96 %
MnIron 13.19 %
FePhosphorus 14.64 %
P Hydrogen 0.12 %
H Oxygen 32.13 %
O Fluorine 6.73 %
F Empirical Formula: Mn2+Fe2+0.5Mg0.3Ca0.2(PO4)F0.75(OH)0.25
Name Origin:From the Greek triplos - "triplex."
Physical Properties: Cleavage:[010] Good, [100] Distinct
Color:brown, dark brown, salmon pink, brownish black, or black.
Density:3.44 - 3.9, Average = 3.67
Diaphaniety:Subtranslucent to opaque
Habits:Massive - Granular - Common texture observed in granite and other igneous rock., ,
Hardness:5 - Apatite
Luminescence:None.
Luster:Resinous - Greasy
Streak:yellowish gray
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