Holtedahlite Mineral Data +

Dan Weinrich Fine Minerals

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
X Ray Diffraction:	By Intensity(I/Io): 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:	relectron=2.93 gm/cc note: rHoltedahlite =2.94 gm/cc.
Fermion Index	Fermion Index = 0.03086 Boson Index = 0.96914
Photoelectric:	PEHoltedahlite = 1.59 barns/electron U=PEHoltedahlite x relectron= 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:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Holtedahlite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz 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: