Nahpoite
A valid IMA mineral species
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About Nahpoite
Formula:
Na2(PO3OH)
Colour:
White
Lustre:
Dull, Earthy
Hardness:
1 - 2
Specific Gravity:
2.58 (Calculated)
Crystal System:
Monoclinic
Name:
Named by L. C. Coleman and B. T. Robertson in 1981 for the elements Na, H, P and O in its chemical composition.
Type Locality:
Powdery white masses and films.
Unique Identifiers
Mindat ID:
2832
Long-form identifier:
mindat:1:1:2832:1
Similar Names
| Neapite | A synonym of 'Apatite nephelinolite' | |
| Népouite | A valid IMA mineral species - grandfathered | Ni3Si2O5(OH)4 |
IMA Classification of Nahpoite
Approved
Approval year:
1981
Classification of Nahpoite
8.AD.05
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
37.1.5.1
37.1.5.1
37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
19.1.3
19 : Phosphates
1 : Phosphates of the alkali metals
19 : Phosphates
1 : Phosphates of the alkali metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Nhp | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Nahpoite
Dull, Earthy
Transparency:
Translucent, Opaque
Colour:
White
Streak:
White
Hardness:
1 - 2 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.58 g/cm3 (Calculated)
Optical Data of Nahpoite
Type:
Biaxial
RI values:
nα = 1.490 nγ = 1.505
Birefringence:
0.015
Max. Birefringence:
δ = 0.015
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
none
Optical Extinction:
parallel
Pleochroism:
Non-pleochroic
Chemistry of Nahpoite
Mindat Formula:
Na2(PO3OH)
Element Weights:
Elements listed:
Crystallography of Nahpoite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 5.471 Å, b = 6.841 Å, c = 5.451 Å
β = 116.338°
β = 116.338°
Ratio:
a:b:c = 0.8 : 1 : 0.797
Unit Cell V:
182.84 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Powdery
Comment:
P21/a alternative space group.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0015788 | Nahpoite | Wiench D M, Jansen M (1983) Kristallstruktur von wasserfreiem Na2HPO4 Zeitschrift fur Anorganische und Allgemeine Chemie 501 95-101 | 1983 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.9 Å | (10) |
| 4.64 Å | (6) |
| 3.98 Å | (45) |
| 3.84 Å | (55) |
| 3.42 Å | (20) |
| 2.88 Å | (40) |
| 2.805 Å | (100) |
| 2.730 Å | (50) |
| 2.720 Å | (25) |
| 2.655 Å | (20) |
| 2.537 Å | (8) |
| 2.528 Å | (4) |
| 2.453 Å | (18) |
| 2.442 Å | (8) |
| 2.320 Å | (8) |
| 2.309 Å | (8) |
| 2.300 Å | (6) |
| 2.205 Å | (8) |
| 2.197 Å | (10) |
| 2.129 Å | (6) |
| 2.068 Å | (8) |
| 2.047 Å | (8) |
| 1.994 Å | (16) |
| 1.988 Å | (8) |
| 1.921 Å | (18) |
| 1.879 Å | (4) |
| 1.812 Å | (8) |
| 1.788 Å | (1) |
| 1.764 Å | (1) |
| 1.751 Å | (18) |
| 1.748 Å | (2) |
| 1.712 Å | (16) |
| 1.647 Å | (6) |
| 1.635 Å | (8) |
| 1.627 Å | (8) |
| 1.615 Å | (1) |
| 1.601 Å | (8) |
| 1.595 Å | (14) |
| 1.583 Å | (6) |
Comments:
ICDD 35-735 (synthetic)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Geological Setting:
sodalite xenoliths, late-stage phosphatian and halogen alterations in alkalic syenite.
Type Occurrence of Nahpoite
General Appearance of Type Material:
Powdery white
Geological Setting of Type Material:
Veined phosphatic ironstones.
Associated Minerals at Type Locality:
Synonyms of Nahpoite
Other Language Names for Nahpoite
Common Associates
Associations Based on Photo Data:
| 2 photos of Nahpoite associated with Whitlockite | Ca9Mg(PO4)6(PO3OH) |
| 2 photos of Nahpoite associated with Arrojadite-(KFe) | (KNa)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2 |
| 2 photos of Nahpoite associated with Kulanite | Ba(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3 |
| 2 photos of Nahpoite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 8.AD. | 'Unnamed (Monoclinic polymorph of ximengite)' | Bi(PO4) |
| 8.AD. | Keplerite | Ca9(Ca0.5◻0.5)Mg(PO4)7 |
| 8.AD. | Mazorite | Ba3(PO4)2 |
| 8.AD. | Deynekoite | Ca9◻Fe3+(PO4)7 |
| 8.AD. | Monazite-(Gd) | Gd(PO4) |
| 8.AD.10 | Weilite | Ca(HAsO4) |
| 8.AD.10 | Švenekite | Ca(H2AsO4)2 |
| 8.AD.10 | Monetite | Ca(PO3OH) |
| 8.AD.15 | Archerite | (K,NH4)(H2PO4) |
| 8.AD.15 | Biphosphammite | NH4(H2PO4) |
| 8.AD.20 | Phosphammite | (NH4)2(PO3OH) |
| 8.AD.25 | Buchwaldite | NaCa(PO4) |
| 8.AD.30 | Schulténite | Pb(HAsO4) |
| 8.AD.35 | Dreyerite | Bi(VO4) |
| 8.AD.35 | Wakefieldite-(La) | La(VO4) |
| 8.AD.35 | Anningite-(Ce) | (Ca0.5Ce4+0.5)(VO4) |
| 8.AD.35 | Pretulite | Sc(PO4) |
| 8.AD.35 | Wakefieldite-(Ce) | Ce(VO4) |
| 8.AD.35 | Wakefieldite-(Y) | Y(VO4) |
| 8.AD.35 | Xenotime-(Yb) | Yb(PO4) |
| 8.AD.35 | 'Chernovite-(Ce)' | (Ce,Y)(AsO4) |
| 8.AD.35 | Xenotime-(Gd) | Gd(PO4) |
| 8.AD.35 | Chernovite-(Y) | Y(AsO4) |
| 8.AD.35 | Xenotime-(Y) | Y(PO4) |
| 8.AD.35 | Wakefieldite-(Nd) | Nd(VO4) |
| 8.AD.40 | Pucherite | Bi(VO4) |
| 8.AD.45 | Ximengite | Bi(PO4) |
| 8.AD.50 | 'UM2005-35-VO:CaFePSiTh' | (Th,Ca)(VO4,SiO4,PO4) |
| 8.AD.50 | Rooseveltite | Bi(AsO4) |
| 8.AD.50 | Gasparite-(Ce) | Ce(AsO4) |
| 8.AD.50 | Monazite-(Sm) | Sm(PO4) |
| 8.AD.50 | Monazite-(Ce) | Ce(PO4) |
| 8.AD.50 | Monazite-(La) | La(PO4) |
| 8.AD.50 | Monazite-(Nd) | Nd(PO4) |
| 8.AD.50 | Gasparite-(La) | La(AsO4) |
| 8.AD.50 | Cheralite | CaTh(PO4)2 |
| 8.AD.55 | Tetrarooseveltite | Bi(AsO4) |
| 8.AD.60 | Chursinite | [Hg2]2+Hg2+2[AsO4]2 |
| 8.AD.65 | Clinobisvanite | Bi(VO4) |
| 8.AD.70 | Gurimite | Ba3(VO4)2 |
| 8.AD.75 | Picaite | NaCa[AsO3OH][AsO2(OH)2] |
Fluorescence of Nahpoite
Creamy-white (shortwave), dull-white (longwave)
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Nahpoite
mindat.org URL:
https://www.mindat.org/min-2832.html
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References for Nahpoite
Reference List:
Coleman, L. C., Robertson, B. T. (1981) Nahpoite Na2HPO4, a new mineral from the Big Fish River area, Yukon Territory. The Canadian Mineralogist, 19 (3) 373-376
Baldus, M., Meier, B. H., Ernst, R. R., Kentgens, A. P. M., Meyer zu Altenschildesche, H., Nesper, R. (1995) Structure Investigation on Anhydrous Disodium Hydrogen Phosphate Using Solid-State NMR and X-ray Techniques. Journal Of The American Chemical Society, 117 (18) 5141-5147 doi:10.1021/ja00123a017
Localities for Nahpoite
Showing 8 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Canada | |
| Grice (1989) +1 other reference |
| Coleman et al. (1981) +1 other reference |
| Robinson et al. (1992) | |
| 150-152. +1 other reference | |
Greenland | |
| Petersen (2001) |
Russia | |
| ... |
| Pekov (2000) |
South Africa | |
| Kamenetsky et al. (2014) |
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Big Fish River, Dawson mining district, Yukon, Canada