Kolbeckite Mineral Data

Kolbeckite Mineral Data +

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General Kolbeckite Information

Chemical Formula:

ScPO4·2(H2O)

Composition:

Molecular Weight = 175.96 gm

Scandium 25.55 % Sc 39.19 % Sc₂O₃

Phosphorus 17.60 % P 40.33 % P₂O₅

Hydrogen 2.29 % H 20.48 % H₂O

Oxygen 54.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sc(PO₄)·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Schmiedeberg, Saxony, Germay. Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich L. W. Kolbeck (1860-1943), mineralogist, Mining Academy, Freiberg, Germany.

Synonym:

Sterrettite

Kolbeckite Image

Images:

Kolbeckite

Comments: Spherical ball of acicular kolbeckite on matrix.
Location: Gleichenberger Klause, Bad Gleichenberg, Steiermark, Austria. Scale: Specimen size 1.5 mm.
© John Veevaert

Kolbeckite 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 - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.88(1), 2.9(0.8), 4.51(0.8),

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Forms: [ 0 1 0] [ 1 1 0] [ 0 1 1] [ 1 0 0]

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Physical Properties of Kolbeckite

Cleavage:

[110] Good, [100] Indistinct, [001] Indistinct

Color:

Blue gray, Colorless, Greenish white, Yellowish, Light blue.

Density:

2.44

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

5 - Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Kolbeckite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.249,KPDmeas= 0.2408,KC= 0.2441

Optical Data:

Biaxial (-), a=1.572, b=1.59, g=1.601, bire=0.0290, 2V(Calc)=74, 2V(Meas)=60.

Calculated Properties of Kolbeckite

Electron Density:

r_electron=2.44 gm/cc
note: r_Kolbeckite=2.44 gm/cc.

Fermion Index

Fermion Index = 0.00026
Boson Index = 0.99974

Photoelectric:

PE_Kolbeckite= 4.41 barns/electron
U=PE_Kolbeckite x r_electron= 10.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kolbeckite is Not Radioactive

Kolbeckite Classification

Dana Class:

40.4.3.3 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.3)Dana Group

40.4.3.1 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

40.4.3.2 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

40.4.3.3 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/C.09-30 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.09 - Variscite group

VII/C.09-10 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

VII/C.09-88 Parascorodite! FeAsO4·2(H2O) HEX ? Hex

VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra

Other Kolbeckite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Kolbeckite

ScPO4·2(H2O)
Dana No: 40.4.3.3 Strunz No: VII/C.09-30
Locality:

Notes: