Kolbeckite Mineral Data Say KOLBECKITE Pronunciation Guide

General Information

Chemical Formula: ScPO4·2(H2O)
Composition: Molecular Weight = 175.96 gm)
  Oxygen 54.56 % O
  Hydrogen 2.29 % H
  Phosphorus 17.60 % P
  Scandium 25.55 % Sc


Dana Class: (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).]


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/Io): 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
  Minerals of Wisconsin
  École des Mines de Paris

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