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Holtedahlite Mineral Data

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General Holtedahlite Information

Help on Chemical  Formula: Chemical Formula: Mg12(PO3OH,CO3)(PO4)5(OH,O)6
Help on Composition: Composition: Molecular Weight = 953.53 gm
   Magnesium   30.59 %  Mg   50.72 % MgO
   Phosphorus  18.68 %  P    42.80 % P2O5
   Hydrogen     0.50 %  H     4.49 % H2O
   Carbon       0.31 %  C     1.15 % CO2
   Oxygen      49.92 %  O
              ______        ______ 
              100.00 %       99.16 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg12(PO3OH)0.75(CO3)0.25(PO4)5(OH)4O2
Help on Environment: Environment: Serpentine-magnesite deposit.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Tingelstadtjern quarry, Modum, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Olaf Holtedahl (1885-1975), Professor of Geology, University of Oslo, Oslo, Norway.
Help on Name Pronunciation: Name Pronunciation: Holtedahlite + Pronunciation Say HOLTEDAHLITE
Help on Synonym: Synonym: ICSD 67048
  PDF 33-879

Holtedahlite Image

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Comments: Colorless glassy crystalline granular holtedahlite (appears gray in image) with yellow serpentinite rock and white apatite.
Location: Tingelstadtjern, Modum, Buskerud, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Holtedahlite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.44425
Help on Cell Dimensions: Cell Dimensions: a = 11.203, c = 4.977, Z = 1; V = 540.96 Den(Calc)= 2.93
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 31m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.438(1), 3.722(0.9), 3.475(0.5),

Physical Properties of Holtedahlite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.94
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Holtedahlite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2041,KPDmeas= 0.2034,KC= 0.1975
Ncalc = 1.58
Help on Optical Data: Optical Data: Uniaxial (-), e=1.597, w=1.599, bire=0.0020.

Calculated Properties of Holtedahlite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Holtedahlite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEHoltedahlite = 1.59 barns/electron
U=PEHoltedahlite x rElectron Density= 4.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Holtedahlite is Not Radioactive

Holtedahlite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.06)where (A)2 (XO4) Zq
  (41.06.04)Satterlyite Group Satterlyite (Fe,Mg)2(PO4)(OH) P 31m 3m Holtedahlite Mg12(PO3OH,CO3)(PO4)5(OH,O)6 P 31m 3m
Help on  Strunz Class: Strunz Class: 08.BB.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1
08.BB.20 Holtedahlite Mg12(PO3OH,CO3)(PO4)5(OH,O)6 P 31m 3m
08.BB.20 Satterlyite (Fe,Mg)2(PO4)(OH) P 31m 3m

Other Holtedahlite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Holtedahlite :
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.BB.20





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