Dittmarite Mineral Data +

Fabre Minerals

General Dittmarite Information
Chemical Formula:	(NH4)Mg(PO4)·(H2O)
Composition:	Molecular Weight = 155.33 gm
	Magnesium   15.65 %  Mg   25.95 % MgO
	Phosphorus  19.94 %  P    45.69 % P2O5
	Hydrogen     2.60 %  H      -   % Calc as (NH4)2O
	Hydrogen     1.30 %  H    11.60 % H2O
	Nitrogen     9.02 %  N    16.76 % (NH4)2O
	Oxygen      51.50 %  O
	______        ______
	100.00 %      100.00 % = TOTAL OXIDE
Empirical Formula:	(NH4)Mg(PO4)·(H2O)
IMA Status:	Valid Species (Pre-IMA) 1887
Locality:	Link to MinDat.org Location Data.
Dittmarite Image
Images:	Dittmarite   Newberyite Comments: Translucent crystalline dittmaritewith more opaque newberyite. Location: Skipton Caves, Victoria, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Dittmarite Crystallography
Axial Ratios:	a:b:c =0.6401:1:0.5467
Cell Dimensions:	a = 5.606, b = 8.758, c = 4.788, Z = 2; V = 235.08 Den(Calc)= 2.19
Crystal System:	Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P mn21
X Ray Diffraction:	By Intensity(I/Io): 8.77(1), 2.8(0.5), 2.92(0.4),
Physical Properties of Dittmarite
Cleavage:	[???] Perfect
Color:	Colorless.
Density:	2.19
Diaphaniety:	Transparent
Hardness:	5 - Apatite
Luster:	Vitreous (Glassy)
Streak:	white
Optical Properties of Dittmarite
Gladstone-Dale:	CI meas= -0.469 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.469 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2571,KPDmeas= 0.2571,KC= 0.1749
Optical Data:	Biaxial (-), a=1.549, b=1.569, g=1.571, bire=0.0220, 2V(Calc)=34, 2V(Meas)=40.
Calculated Properties of Dittmarite
Electron Density:	relectron=2.26 gm/cc note: rDittmarite =2.19 gm/cc.
Fermion Index	Fermion Index = 0.10574 Boson Index = 0.89426
Photoelectric:	PEDittmarite = 1.34 barns/electron U=PEDittmarite x relectron= 3.02 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Dittmarite is Not Radioactive
Dittmarite Classification
Dana Class:	40.1.2.1 (40)Hydrated Phosphates, etc
	(40.1)where A++ B++ (XO4) · x(H2O)
	(40.1.2)Dana Group
	40.1.2.1 Dittmarite (NH4)Mg(PO4)·(H2O) P mn21 mm2
	40.1.2.2 Niahite (NH4)(Mn,Mg,Ca)PO4·(H2O) P mn21 mm2
Strunz Class:	VII/C.23-20 VII - Phosphates, Arsenates and Vanadates
	VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+
	VII/C.23 - Struvite - Mundrabillaite series
	VII/C.23-10 Struvite (NH4)MgPO4·6(H2O) P mn21 mm2
	VII/C.23-20 Dittmarite (NH4)Mg(PO4)·(H2O) P mn21 mm2
	VII/C.23-30 Niahite (NH4)(Mn,Mg,Ca)PO4·(H2O) P mn21 mm2
	VII/C.23-40 Hannayite (NH4)2Mg3H4(PO4)4·8(H2O) P1 1
	VII/C.23-50 Schertelite (NH4)2MgH2(PO4)2·4(H2O) P bca 2/m 2/m 2/m
	VII/C.23-60 Stercorite H(NH4)Na(PO4)·4(H2O) P1 1
	VII/C.23-65 Swaknoite (NH4)2Ca(HPO4)2·(H2O) Unk Ortho
	VII/C.23-70 Mundrabillaite (NH4)2Ca(HPO4)2·(H2O) Pm,P 2,P 2/m Mono
Other Dittmarite 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 Dittmarite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Dittmarite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Dittmarite : 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 Dittmarite Mineral Data : Ask about Dittmarite 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 Dittmarite Specimen Label here : Dittmarite (NH4)Mg(PO4)·(H2O) Dana No: 40.1.2.1 Strunz No: VII/C.23-20 Locality:   Notes: