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Nahpoite

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Formula:
Na2HPO4
System:
Monoclinic
Colour:
White
Lustre:
Dull, Earthy
Hardness:
1 - 2
Name:
Named by L. C. Coleman and B. T. Robertson in 1981 for the elements Na, H, P and O in its chemical composition.
This page provides mineralogical data about Nahpoite.

Classification of Nahpoite

Approved
8.AD.05

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
19.1.3

19 : Phosphates
1 : Phosphates of the alkali metals
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http://www.mindat.org/min-2832.html
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First Recorded Occurrence of Nahpoite

General Appearance of First Recorded Material:
Powdery white
Year of Discovery:
1981
Geological Setting of First Recorded Material:
Veined phosphatic ironstones.
Associated Minerals at First Recorded Locality:

Physical Properties of Nahpoite

Dull, Earthy
Diaphaneity (Transparency):
Translucent
Colour:
White
Streak:
White
Hardness (Mohs):
1 - 2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.58 g/cm3 (Calculated)

Crystallography of Nahpoite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 5.47Å, b = 6.84Å, c = 5.45Å
β = 116.33°
Ratio:
a:b:c = 0.8 : 1 : 0.797
Unit Cell Volume:
V 182.76 ų (Calculated from Unit Cell)
Z:
2
Comment:
P 21/a alternative space group
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.98 (50)
3.84 (60)
3.42 (20)
2.88 (40)
2.81 (100)
2.73 (50)
2.72 (30)
2.66 (20)
Comments:
ICDD 35-735 (synthetic)

Optical Data of Nahpoite

Type:
Biaxial
RI values:
nα = 1.490 nγ = 1.505
Birefringence:
0.015
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Optical Extinction:
parallel
Pleochroism:
Non-pleochroic

Chemical Properties of Nahpoite

Formula:
Na2HPO4
Essential elements:
All elements listed in formula:

Relationship of Nahpoite to other Species

8.AD.10MonetiteCa(HPO4)
8.AD.10WeiliteCa(HAsO4)
8.AD.10ŠvenekiteCa(H2AsO4)2
8.AD.15Archerite(K,NH4)(H2PO4)
8.AD.15Biphosphammite(NH4,K)(H2PO4)
8.AD.20Phosphammite(NH4)2(HPO4)
8.AD.25BuchwalditeNaCa(PO4)
8.AD.30SchultenitePb(HAsO4)
8.AD.35Chernovite-(Y)Y(AsO4)
8.AD.35DreyeriteBi(VO4)
8.AD.35Wakefieldite-(Ce)Ce(VO4)
8.AD.35Wakefieldite-(Y)Y(VO4)
8.AD.35Xenotime-(Y)Y(PO4)
8.AD.35PretuliteSc(PO4)
8.AD.35Xenotime-(Yb)(Yb,Y,HREE)(PO4)
8.AD.35Wakefieldite-(La)La(VO4)
8.AD.40PucheriteBi(VO4)
8.AD.45XimengiteBi(PO4)
8.AD.50Gasparite-(Ce)(Ce,REE)(AsO4)
8.AD.50Monazite-(Ce)(Ce,La,Nd,Th)(PO4)
8.AD.50Monazite-(La)(La,Ce,Nd)(PO4)
8.AD.50Monazite-(Nd)(Nd,La,Ce)(PO4)
8.AD.50RooseveltiteBi(AsO4)
8.AD.50Cheralite(Ca,Ce)(Th,Ce)(PO4)2
8.AD.50Monazite-(Sm)(Sm,Gd,Ce,Th)(PO4)
8.AD.50UM2005-35-VO:CaFePSiTh(Th,Ca)(VO4,SiO4,PO4)
8.AD.55TetrarooseveltiteBi(AsO4)
8.AD.60Chursinite(Hg2+)0.5Hg2+(AsO4)
8.AD.65ClinobisvaniteBi(VO4)
19.1.1LithiophosphateLi3PO4
19.1.2OlympiteNa5Li(PO4)2
19.1.4DorfmaniteNa2HPO4 · 2H2O
19.1.5NalipoiteNaLi2PO4
19.1.6StercoriteNa(NH4)HPO4 · 4H2O
19.1.7Archerite(K,NH4)(H2PO4)
19.1.8Biphosphammite(NH4,K)(H2PO4)
19.1.9Phosphammite(NH4)2(HPO4)
19.1.10LithiophiliteLiMn2+PO4
19.1.11SickleriteLi1-x(Mnx3+Mn2+1-x)PO4
19.1.12FerrisickleriteLi1-x(Fex3+Fe2+1-x)PO4
19.1.13TriphyliteLiFe2+PO4
19.1.14TavoriteLiFe3+(PO4)(OH)
19.1.15MarićiteNaFe2+(PO4)

Other Names for Nahpoite

Name in Other Languages:
German:Nahpoit
Spanish:Nahpoita

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.

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. Canadian Mineralogist: 19: 373-376. Abstracted: American Mineralogist (1982): 67: 856-857.
ROBINSON, G.W., VAN VELTHUIZEN, J., ANSELL, H.G. & STURMAN, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area, Yukon Territory. Mineralogical Record 23, 1-47.
Journal of the American Chemical Society (1995): 117: 5141-5147.

Internet Links for Nahpoite

Localities for Nahpoite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
  • Yukon Territory
    • Dawson Mining District
COLEMAN, L.C. & ROBERTSON, B.T. (1981): Nahpoite Na2HPO4, a new mineral from the Big Fish River area, Yukon Territory. Canadian Mineralogist 19, 373-376. ROBINSON, G.W., VAN VELTHUIZEN, J., ANSELL, H.G. & STURMAN, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area, Yukon Territory. Mineralogical Record 23, 1-47.
Robinson, G.W., Van Velthuizen, J., Ansell, H.G. & Sturman, B.D. (1992): Mineralogy of the Rapid Creek and Big Fish River area, Yukon Territory. Mineralogical Record 23, 1-47.
Greenland
 
  • Kujalleq
    • Narsaq
Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
www.koeln.netsurf.de/~w.steffens/khib.htm
        • Lovozero Massif
          • Alluaiv Mt
            • Umbozero mine (Umbozerskii mine; Umba Mine)
Pekov, I.V. (2000): Lovozero Massif. Moscow, Ocean Pictures Ltd, 480 pp.
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