Kolbeckite Mineral Data

General Kolbeckite Information

Chemical Formula:

ScPO4•2(H2O)

Composition:

Molecular Weight = 176.18 gm

Scandium 23.99 % Sc 36.79 % Sc₂O₃

Aluminum 0.15 % Al 0.29 % Al₂O₃

Vanadium 0.87 % V 1.28 % V₂O₃

Iron 0.63 % Fe 0.91 % Fe₂O₃

Phosphorus 17.58 % P 40.28 % P₂O₅

Hydrogen 2.29 % H 20.45 % H₂O

Oxygen 54.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sc_0.94V³⁺_0.03Fe³⁺_0.02Al_0.01(PO₄)•2(H₂O)

Environment:

Isomorphous with metavariscite.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Schmiedeberg, Saxony, Germay. Hot Springs County, Arkansas. Link to MinDat.org Location Data.

Name Origin:

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

Name Pronunciation:

Kolbeckite + Pronunciation

Synonym:

Eggonite

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 =0.5318:1:0.873

Cell Dimensions:

a = 5.4258, b = 10.2027, c = 8.9074, Z = 4; beta = 90.502° V = 493.08 Den(Calc)= 2.37

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ 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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Crystal Structure:

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Yang H , Li C , Jenkins R A , Downs R T , Costin G , Acta Crystallographica, Section C , 63 (2007) p.i91-i92, Kolbeckite, ScPO4*2H2O, isomorphous with metavariscite, Locality: Hot Springs County, Arkansas, USA

Physical Properties of Kolbeckite

Cleavage:

{110} Good, {100} Indistinct, {001} Indistinct

Color:

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

Density:

2.44

Diaphaneity:

Transparent

Fracture:

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

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

5 - Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Kolbeckite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.248,KPDmeas= 0.2408,KC= 0.2448
Ncalc = 1.58 - 1.6

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:

Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Kolbeckite =2.37 gm/cc.

Fermion Index:

Fermion Index = 0.0004210732
Boson Index = 0.9995789268

Photoelectric:

PE_Kolbeckite= 4.54 barns/electron
U=PE_Kolbeckite x rElectron Density= 10.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kolbeckite is Not Radioactive

Kolbeckite Classification

Dana Class:

40.04.03.03 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 · x(H2O)

(40.04.03)Metavariscite group

40.04.03.01 Metavariscite AlPO4•2(H2O) P 2₁/n 2/m

40.04.03.02 Phosphosiderite FePO4•2(H2O) P 2₁/n 2/m

40.04.03.03 Kolbeckite ScPO4•2(H2O) P 2₁/n 2/m

Strunz Class:

08.CD.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CD -With only medium-sized cations, RO4:H2O = 1:2

08.CD.05 Kolbeckite ScPO4•2(H2O) P 2₁/n 2/m

08.CD.05 Metavariscite AlPO4•2(H2O) P 2₁/n 2/m

08.CD.05 Phosphosiderite FePO4•2(H2O) P 2₁/n 2/m

Other Kolbeckite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v93:1690) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kolbeckite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Kolbeckite Specimen Label here :

Kolbeckite

ScPO4•2(H2O)
Dana No: 40.04.03.03 Strunz No: 08.CD.05
Locality:

Notes: