Kolbeckite Mineral Data

eneral Information
Chemical Formula:	ScPO4·2(H2O)
Composition:	Molecular Weight = 175.96 gm)
	Oxygen54.56 %O
	Hydrogen2.29 %H
	Phosphorus17.60 %P
	Scandium25.55 %Sc
Classification
Dana Class:	40.4.3.3 (40)Hydrated Phosphates, etc (40.4)where A+++ XO4 · x(H2O) (40.4.3)Dana Group
Strunz Class:	VII/C.09-30 – Phosphates, Arsenates, and Vanadates [Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg (Variscite group).]
Crystallography
Axial Ratios:	a:b:c =0.8727:1:0.5322
Cell Dimensions:	a = 8.92, b = 10.22, c = 5.44, Z = 4; V = 495.92 Den(Calc)= 2.36
Crystal System:	Orthorhombic – Disphenoidal H-M Symbol (2 2 2) Space Group: P212121
X Ray Diffraction:	By Intensity(I/I_o): 4.88(1) 2.9(0.8) 4.51(0.8)
Physical Properties
Cleavage:	[110] Good, [100] Indistinct, [001] Indistinct
Color:	blue gray, colorless, greenish white, yellowish, or light blue.
Density:	2.44
Diaphaniety:	Transparent
Hardness:	5 – Apatite
Luster:	Vitreous – Pearly
Streak:	white
Optical Properties
Optical Data:	Biaxial (-), a=1.572, b=1.59, g=1.601, bire=0.0290, 2V(Calc)=74, 2V(Meas)=60.
Other Information
References:	PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:	Athena Mineralogy
	Frederic Biret
	Google
	MinMax
	Minerals of Wisconsin
	École des Mines de Paris