Kolbeckite Mineral Data
General Kolbeckite Information
Chemical Formula:
ScPO4•2(H2O)
Composition:
Molecular Weight = 176.18 gm
Scandium 23.99 % Sc 36.79 % Sc2 O3
Aluminum 0.15 % Al 0.29 % Al2 O3
Vanadium 0.87 % V 1.28 % V2 O3
Iron 0.63 % Fe 0.91 % Fe2 O3
Phosphorus 17.58 % P 40.28 % P2 O5
Hydrogen 2.29 % H 20.45 % H2 O
Oxygen 54.49 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Sc0.94 V3+ 0.03 Fe3+ 0.02 Al0.01 (PO4 )•2(H2 O)
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 - Prismatic H-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:
Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
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)
Warning: this java applet does not work in some browsers because of security restrictions.
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/electronU=PEKolbeckite x r Electron 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
Search for Kolbeckite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Kolbeckite :
Ask about Kolbeckite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
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:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.