Dittmarite Mineral Data

Dittmarite Mineral Data +

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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

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

By Intensity(I/I_o): 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:

r_electron=2.26 gm/cc
note: r_Dittmarite=2.19 gm/cc.

Fermion Index

Fermion Index = 0.10574
Boson Index = 0.89426

Photoelectric:

PE_Dittmarite= 1.34 barns/electron
U=PE_Dittmarite x r_electron= 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)

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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: