General Information:
Chemical Formula:
Fe+++PO4·2(H2O)
Composition:
(Molecular Weight = 186.85 gm)
Iron 29.89 % Fe
Phosphorus 16.58 % P
Hydrogen 2.16 % H
Oxygen 51.38 % O
Empirical Formula:
Fe3+(PO4)·2(H2O)
Name Origin:
Named after the German mineralogist, J. A. Streng (1830-1897).
Physical Properties:
Cleavage:
[001] Perfect, [010] Good
Color:
colorless, pale violet, deep violet, red, or carmine red.
Density:
2.87
Diaphaniety:
Translucent
Habits:
Spherical - Spherical, rounded aggregates., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Botryoidal - "Grape-like" rounded forms (e.g.. mal achite).
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
More details...