Nahpoite Mineral Data

General Nahpoite Information

Chemical Formula:

Na2HPO4

Composition:

Molecular Weight = 141.96 gm

Sodium 32.39 % Na 43.66 % Na₂O

Phosphorus 21.82 % P 49.99 % P₂O₅

Hydrogen 0.71 % H 6.35 % H₂O

Oxygen 45.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂(HPO₄)

IMA Status:

Approved IMA 1981

Locality:

Big Fish River in northern Richarson Mountains, Yukon Territory, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for its composition (NaHPO-).

Name Pronunciation:

Nahpoite

Synonym:

ICSD 37142

IMA1981-002

PDF 35-735

Nahpoite Image

Images:

Nahpoite

Comments: Nearly opaque white powdery nahpoite.
Location: Big Fish River, Yukon Territory, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nahpoite Crystallography

Axial Ratios:

a:b:c =0.7997:1:0.7967

Cell Dimensions:

a = 5.47, b = 6.84, c = 5.45, Z = 2; beta = 116.33° V = 182.76 Den(Calc)= 2.58

Crystal System:

Monoclinic Space Group: P 2₁/m,P 2₁

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

By Intensity(I/I_o): 2.803(1), 2.72(0.7), 3.84(0.55),

Physical Properties of Nahpoite

Color:

White.

Density:

2.58

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Nahpoite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1928,KPDmeas= 0.1928,KC= 0.196
Ncalc = 1.51

Optical Data:

Biaxial (?), a=1.49, g=1.505, bire=0.0150

Calculated Properties of Nahpoite

Electron Density:

Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Nahpoite =2.58 gm/cc.

Fermion Index:

Fermion Index = 0.0002174577
Boson Index = 0.9997825423

Photoelectric:

PE_Nahpoite= 1.56 barns/electron
U=PE_Nahpoite x rElectron Density= 3.98 barns/cc.

Radioactivity:

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

Nahpoite Classification

Dana Class:

37.01.05.01 (37)Anhydrous Acid Phosphates, etc

(37.01)with miscellaneous formulae

(37.01.05)Dana Group

37.01.05.01 Nahpoite Na2HPO4 P 2₁/m,P 2₁ Mono

Strunz Class:

08.AD.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.05 Nahpoite Na2HPO4 P 2₁/m,P 2₁ Mono

Other Nahpoite Information

References:

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

See Also:

Links to other databases for Nahpoite :
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 Nahpoite Specimen Label here :

Nahpoite

Na2HPO4
Dana No: 37.01.05.01 Strunz No: 08.AD.05
Locality:

Notes:

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