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Kolbeckite Mineral Data

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General Kolbeckite Information

Help on Chemical  Formula: Chemical Formula: ScPO4•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Sc0.94V3+0.03Fe3+0.02Al0.01(PO4)•2(H2O)
Help on Environment: Environment: Isomorphous with metavariscite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1926
Help on Locality: Locality: Schmiedeberg, Saxony, Germay. Hot Springs County, Arkansas. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Friedrich L. W. Kolbeck (1860-1943), mineralogist, Mining Academy, Freiberg, Germany.
Help on Name Pronunciation: Name Pronunciation: Kolbeckite + Pronunciation Say KOLBECKITE
Help on Synonym: Synonym: Eggonite

Kolbeckite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.5318:1:0.873
Help on Cell Dimensions: Cell Dimensions: a = 5.4258, b = 10.2027, c = 8.9074, Z = 4; beta = 90.502° V = 493.08 Den(Calc)= 2.37
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.88(1), 2.9(0.8), 4.51(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 1 0) ( 0 1 1) ( 1 0 0)

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Physical Properties of Kolbeckite

Help on Cleavage: Cleavage: {110} Good, {100} Indistinct, {001} Indistinct
Help on Color: Color: Blue gray, Colorless, Greenish white, Yellowish, Light blue.
Help on Density: Density: 2.44
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Kolbeckite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Kolbeckite =2.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0004210732
Boson Index = 0.9995789268
Help on Photoelectric: Photoelectric: PEKolbeckite = 4.54 barns/electron
U=PEKolbeckite x rElectron Density= 10.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kolbeckite is Not Radioactive

Kolbeckite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.03)Metavariscite group Metavariscite AlPO4•2(H2O) P 21/n 2/m Phosphosiderite FePO4•2(H2O) P 21/n 2/m Kolbeckite ScPO4•2(H2O) P 21/n 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin v93:1690) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 08.CD.05





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