Holtedahlite Mineral Data

Holtedahlite Mineral Data +

[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery]
Serving the mineral collector and educator community since 1970
Over 900,000 mineral specimens in stock
New minerals acquired weekly - Wright's Rock Shop

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

IMA Status:

Approved IMA 1979

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Holtedahlite

Electron Density:

r_electron=2.93 gm/cc
note: r_Holtedahlite=2.94 gm/cc.

Fermion Index

Fermion Index = 0.03086
Boson Index = 0.96914

Photoelectric:

PE_Holtedahlite= 1.59 barns/electron
U=PE_Holtedahlite x r_electron= 4.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Holtedahlite is Not Radioactive

Holtedahlite Classification

Dana Class:

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

(41.6)where (A)2 (XO4) Zq

(41.6.4)Dana Group

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

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

Strunz Class:

VII/B.04-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.04 - Althausite - Satterlyite series

VII/B.04-10 Althausite Mg2(PO4)(OH,F,O) P na2₁ mm2

VII/B.04-20 Holtedahlite Mg12(PO3OH,CO3)(PO4)5(OH,O)6 P 3₁m 3m

VII/B.04-25 Phosphoellenbergerite! Mg14(PO4)6(PO3OH,CO3)2(OH)6 P 6₃mc 6mm

VII/B.04-30 Satterlyite (Fe,Mg)2(PO4)(OH) P 3₁m 3m

Other Holtedahlite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

Search for Holtedahlite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Holtedahlite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Holtedahlite Mineral Data :

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: 41.6.4.2 Strunz No: VII/B.04-20
Locality:

Notes: