Holtedahlite Mineral Data

General Holtedahlite Information

Chemical Formula:

Mg12(PO3OH,CO3)(PO4)5(OH,O)6

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

Empirical Formula:

Mg₁₂(PO₃OH)_0.75(CO₃)_0.25(PO₄)₅(OH)₄O₂

Environment:

Serpentine-magnesite deposit.

IMA Status:

Approved IMA 1979

Locality:

Tingelstadtjern quarry, Modum, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Olaf Holtedahl (1885-1975), Professor of Geology, University of Oslo, Oslo, Norway.

Name Pronunciation:

Holtedahlite + Pronunciation

Synonym:

ICSD 67048

PDF 33-879

Holtedahlite Image

Images:

Holtedahlite

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

Axial Ratios:

a:c = 1:0.44425

Cell Dimensions:

a = 11.203, c = 4.977, Z = 1; V = 540.96 Den(Calc)= 2.93

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.438(1), 3.722(0.9), 3.475(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Romming C , Raade G , Mineralogy and Petrology , 40 (1989) p.91-100, The crystal structure of natural and synthetic holtedahlite, Locality: Tingelstadtjern serpentine-magnesium deposit, Modum, Norway

View Additional jPOWD Structure files for Holtedahlite
[1]

Physical Properties of Holtedahlite

Cleavage:

None

Color:

Colorless.

Density:

2.94

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

4.5-5 - Near Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Holtedahlite

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

Optical Data:

Uniaxial (-), e=1.597, w=1.599, bire=0.0020.

Calculated Properties of Holtedahlite

Electron Density:

Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Holtedahlite =2.94 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Holtedahlite= 1.59 barns/electron
U=PE_Holtedahlite x rElectron Density= 4.64 barns/cc.

Radioactivity:

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

Holtedahlite Classification

Dana Class:

41.06.04.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.06)where (A)2 (XO4) Zq

(41.06.04)Satterlyite Group

41.06.04.01 Satterlyite (Fe,Mg)2(PO4)(OH) P 3₁m 3m

41.06.04.02 Holtedahlite Mg12(PO3OH,CO3)(PO4)5(OH,O)6 P 3₁m 3m

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

Search for Holtedahlite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Holtedahlite :

A Bijoux Google Search for Holtedahlite
Adam's Minerals Google Search for Holtedahlite
Cape Minerals Google Search for Holtedahlite
Dakota Matrix Minerals Google Search for Holtedahlite
Excalibur Mineral Corp. Google Search for Holtedahlite
Exceptional Minerals Google Search for Holtedahlite
John Betts Fine Minerals Search for Holtedahlite
McDougall Minerals Google Search for Holtedahlite
Mineral News Website Link
Rock and Mineral Shows Google Search for Holtedahlite
Weinrich Minerals, Inc. Google Search for Holtedahlite

Ask about Holtedahlite 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 Español

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

Holtedahlite

Mg12(PO3OH,CO3)(PO4)5(OH,O)6
Dana No: 41.06.04.02 Strunz No: 08.BB.20
Locality:

Notes: