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Nahpoite

Big Photo

Big Fish River, Dawson Mining District, Yukon Territory, Canada
© 2008, J. Weissman

Formula:
Na
 
2
HPO
 
4
System:MonoclinicColour:White
Lustre:EarthyHardness:1 - 2
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
Year of Discovery:1981

Physical Properties of Nahpoite

Lustre:Earthy
Colour:White
Hardness (Mohs):1 - 2

Crystallography of Nahpoite

Crystal System:Monoclinic
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)

Optical Data of Nahpoite

Type:Biaxial
RI values: nα = 1.490 nγ = 1.505
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

Chemical Properties of Nahpoite

Formula:
Na
 
2
HPO
 
4
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
CaHPO
 
4
8.AD.10Weilite
CaHAsO
 
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
NaCaPO
 
4
8.AD.30Schultenite
PbHAsO
 
4
8.AD.35Chernovite-(Y)
YAsO
 
4
8.AD.35Clinobisvanite
BiVO
 
4
8.AD.35Dreyerite
BiVO
 
4
8.AD.35Wakefieldite-(Ce)
(Ce,Pb)VO
 
4
8.AD.35Wakefieldite-(Y)
YVO
 
4
8.AD.35Xenotime-(Y)
YPO
 
4
8.AD.35Pretulite
ScPO
 
4
8.AD.35Xenotime-(Yb)
YbPO
 
4
8.AD.40Pucherite
BiVO
 
4
8.AD.45Ximengite
BiPO
 
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
BiAsO
 
4
8.AD.50Cheralite
CaTh[PO
 
4
]
 
2
8.AD.50Monazite-(Sm)
(Sm,Gd,Ce,Th)(PO
 
4
)
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg-Hg)
 
0.5
Hg
2+
 
[AsO
 
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
(PO
 
3
OH)·2H
 
2
O
19.1.5Nalipoite
NaLi
 
2
[PO
 
4
]
19.1.6Stercorite
NaNH
 
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
(LiMn
2+
 
,Fe
3+
 
)[PO
 
4
]
19.1.12Ferrisicklerite
(Fe
3+
 
,LiMn
2+
 
)[PO
 
4
]
19.1.13Triphylite
LiFe
2+
 
[PO
 
4
]
19.1.14Tavorite
LiFe
3+
 
[OH|PO
 
4
]
19.1.15Marićite
NaFe
2+
 
[PO
 
4
]

Other Names for Nahpoite

Synonyms:
IMA1981-002
German names:
Nahpoit
Spanish names:
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.

American Mineralogist (1982): 67: 856-857.

Journal of the American Chemical Society (1995): 117: 5141-5147.

Internet Links for Nahpoite

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    Localities for Nahpoite

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    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.
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    (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
      • Rouville Co.
        • 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
    		[Mineralogical Record Vol 23 No.4 pp 38]
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		www.koeln.netsurf.de/~w.steffens/khib.htm
          • Lovozero Massif
            • Alluaiv Mt
              • Umbozero Mine
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