Kolbeckite Mineral Data (original) (raw)
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:
Sc0.94V3+0.03Fe3+0.02Al0.01(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 |
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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
X Ray Diffraction:
By Intensity(I/Io): 4.88(1), 2.9(0.8), 4.51(0.8),
Forms:
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| | Forms:( 0 1 0) ( 1 1 0) ( 0 1 1) ( 1 0 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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:
PEKolbeckite = 4.54 barns/electron
U=PEKolbeckite 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: