Dorfmanite Mineral Data

General Dorfmanite Information

Chemical Formula:

Na2(PO3OH)•2(H2O)

Composition:

Molecular Weight = 177.99 gm

Sodium 25.83 % Na 34.82 % Na₂O

Phosphorus 17.40 % P 39.87 % P₂O₅

Hydrogen 2.83 % H 25.30 % H₂O

Oxygen 53.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂(PO₃OH)•2(H₂O)

Environment:

Formed by alteration of lomonosovite in drill cores in alkalic pegmatites.

IMA Status:

Approved IMA 1980

Locality:

Khibina and Lovozero massifs, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Moisei Davidovich Dorfman (1908-), Russian mineralogist who first reported a sodium phosphate in 1963.

Name Pronunciation:

Dorfmanite + Pronunciation

Synonym:

ICSD 1289

PDF 10-190

Dorfmanite Image

Images:

Dorfmanite

Comments: White cottony coatings of dorfmanite on matrix.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dorfmanite Crystallography

Axial Ratios:

a:b:c =0.6147:1:0.3573

Cell Dimensions:

a = 10.34, b = 16.82, c = 6.01, Z = 8; V = 1,045.25 Den(Calc)= 2.26

Crystal System:

Orthorhombic Space Group: Unk

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

By Intensity(I/I_o): 3.35(1), 3.36(1), 4.67(0.9),

Physical Properties of Dorfmanite

Cleavage:

{???} Indistinct

Color:

White.

Density:

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Habit:

Very Soluble - Material dissolves readily in water leaving no residue.

Hardness:

1-1.5 - Talc or a little harder

Streak:

white

Optical Properties of Dorfmanite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KPDmeas= 0.231,KC= 0.2252
Ncalc = 1.45 - 1.51

Optical Data:

Biaxial (+), a=1.454, b=1.461, g=1.471, bire=0.0170, 2V(Calc)=82, 2V(Meas)=65. Dispersion very weak, r > v.

Calculated Properties of Dorfmanite

Electron Density:

Bulk Density (Electron Density)=2.02 gm/cc
note: Specific Gravity of Dorfmanite =2.00 gm/cc.

Fermion Index:

Fermion Index = 0.0002631293
Boson Index = 0.9997368707

Photoelectric:

PE_Dorfmanite= 1.29 barns/electron
U=PE_Dorfmanite x rElectron Density= 2.62 barns/cc.

Radioactivity:

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

Dorfmanite Classification

Dana Class:

39.01.08.01 (39)Hydrated Acid Phosphates, etc

(39.01)A+ [HXO4] ï¿½ x(H2O)

(39.01.08)Dana Group

39.01.08.01 Dorfmanite Na2(PO3OH)•2(H2O) Unk Ortho

39.01.08.02 Catalanoite! Na2H(PO4)•8(H2O) I bca 2/m 2/m 2/m

Strunz Class:

08.CJ.60 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.60 Dorfmanite Na2(PO3OH)•2(H2O) Unk Ortho

Other Dorfmanite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Dorfmanite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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

Dorfmanite

Na2(PO3OH)•2(H2O)
Dana No: 39.01.08.01 Strunz No: 08.CJ.60
Locality:

Notes:

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