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Nahpoite

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Formula:
Na
 
2
HPO
 
4
System:MonoclinicColour:White
Lustre:Dull, EarthyHardness: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

IMA status:Approved
Strunz 8th edition ID:7/A.12-52
Nickel-Strunz 10th (pending) edition ID:8.AD.05

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th edition ID:37.1.5.1
Dana 8th edition ID:37.1.5.1

37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
Hey's CIM Ref.:19.1.3

19 : Phosphates
1 : Phosphates of the alkali metals
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Type Occurrence of Nahpoite

Type Locality:Big Fish River, Dawson Mining District, Yukon Territory, Canada
General Appearance of Type Material:Powdery white
Year of Discovery:1981
Geological Setting of type material:Veined phosphatic ironstones.
Associated Minerals at type locality:
SatterlyiteMarićite

Physical Properties of Nahpoite

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

Crystallography of Nahpoite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
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:
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
Maximum Birefringence:δ = 0.015

Chart 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:
Na
 
2
HPO
 
4
Simplified for copy/paste:Na2HPO4
Essential elements:H, Na, O, P
All elements listed in formula:H, Na, O, P

Relationship of Nahpoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AD.10Monetite
Ca(HPO
 
4
)
8.AD.10Weilite
Ca(HAsO
 
4
)
8.AD.10Švenekite
Ca(H
 
2
AsO
 
4
)
 
2
8.AD.15Archerite
(K,NH
 
4
)(H
 
2
PO
 
4
)
8.AD.15Biphosphammite
(NH
 
4
,K)(H
 
2
PO
 
4
)
8.AD.20Phosphammite
(NH
 
4
)
 
2
(HPO
 
4
)
8.AD.25Buchwaldite
NaCa(PO
 
4
)
8.AD.30Schultenite
Pb(HAsO
 
4
)
8.AD.35Chernovite-(Y)
Y(AsO
 
4
)
8.AD.35Dreyerite
Bi(VO
 
4
)
8.AD.35Wakefieldite-(Ce)
Ce(VO
 
4
)
8.AD.35Wakefieldite-(Y)
Y(VO
 
4
)
8.AD.35Xenotime-(Y)
Y(PO
 
4
)
8.AD.35Pretulite
Sc(PO
 
4
)
8.AD.35Xenotime-(Yb)
(Yb,Y,HREE)(PO
 
4
)
8.AD.35Wakefieldite-(La)
La(VO
 
4
)
8.AD.40Pucherite
Bi(VO
 
4
)
8.AD.45Ximengite
Bi(PO
 
4
)
8.AD.50Gasparite-(Ce)
(Ce,REE)(AsO
 
4
)
8.AD.50Monazite-(Ce)
(Ce,La,Nd,Th)(PO
 
4
)
8.AD.50Monazite-(La)
(La,Ce,Nd)(PO
 
4
)
8.AD.50Monazite-(Nd)
(Nd,La,Ce)(PO
 
4
)
8.AD.50Rooseveltite
Bi(AsO
 
4
)
8.AD.50Cheralite
(Ca,Ce)(Th,Ce)(PO
 
4
)
 
2
8.AD.50Monazite-(Sm)
(Sm,Gd,Ce,Th)(PO
 
4
)
8.AD.50UM2005-35-VO:CaFePSiTh
(Th,Ca)(VO
 
4
,SiO
 
4
,PO
 
4
)
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg
+
2
)
 
0.5
Hg
2+
 
(AsO
 
4
)
8.AD.65Clinobisvanite
Bi(VO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
19.1.1Lithiophosphate
Li
 
3
PO
 
4
19.1.2Olympite
Na
 
5
Li(PO
 
4
)
 
2
19.1.4Dorfmanite
Na
 
2
HPO
 
4
· 2H
 
2
O
19.1.5Nalipoite
NaLi
 
2
PO
 
4
19.1.6Stercorite
Na(NH
 
4
)HPO
 
4
· 4H
 
2
O
19.1.7Archerite
(K,NH
 
4
)(H
 
2
PO
 
4
)
19.1.8Biphosphammite
(NH
 
4
,K)(H
 
2
PO
 
4
)
19.1.9Phosphammite
(NH
 
4
)
 
2
(HPO
 
4
)
19.1.10Lithiophilite
LiMn
2+
 
PO
 
4
19.1.11Sicklerite
Li
 
1-x
(Mn
3+
x
Mn
2+
1-x
)PO
 
4
19.1.12Ferrisicklerite
Li
 
1-x
(Fe
3+
x
Fe
2+
1-x
)PO
 
4
19.1.13Triphylite
LiFe
2+
 
PO
 
4
19.1.14Tavorite
LiFe
3+
 
(PO
 
4
)(OH)
19.1.15Marićite
NaFe
2+
 
(PO
 
4
)

Other Names for Nahpoite

Synonyms:
IMA1981-002
Other Languages:
German:Nahpoit
Spanish:Nahpoita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
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  • Nahpoite details from Handbook of Mineralogy (PDF)
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  • Localities for Nahpoite

    The 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. ? 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)
    Pekov, I.V. (2000): Lovozero Massif. Moscow, Ocean Pictures Ltd, 480 pp.
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