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Nahpoite (Nahpoit)

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Nahpoit
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Nahpoit
Bildbreite: 2 mm, Fundort: Big Fish River, Yukon Territory, Kanada
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Kanada/Yukon-Territorium/Dawson Mining District/Richardson Mountains/Big Fish River
Mineral: Nahpoite
Image: 1297721472
Rating: 1 (votes: 1)
License: Usage for Mineralienatlas project only
Nahpoit

Bildbreite: 2 mm, Fundort: Big Fish River, Yukon Territory, Kanada

Copyright: Luigi Chiappino
Contribution: thdun5 2011-02-14
Locality: Big Fish River / Richardson Mountains / Dawson Mining District / Yukon-Territorium / Kanada

Collectors Summary

Color weiß
Streak color weiß
Hardness (Mohs) 1.5
Solubility +++ H2O, hygroskopisch -> Dorfmanit
Crystal System monoklin, P21/m

Chemism

Chemical formula

Na2HPO4

Chemical composition

Natrium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 141.9589686 u; Number of atoms in the formula: 8

Info

Empirical formula:

Na2HPO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.71

1

12.50

1.0079470

1.0079470

Oxygen

O

45.08

4

50.00

15.9994300

63.9977200

Sodium

Na

32.39

2

25.00

22.9897702

45.9795404

Phosphorus

P

21.82

1

12.50

30.9737612

30.9737612

Analysis wt%

Na2O : 43.67, P2O5 : 49.54, H2O : 6.32 (Ref: Canadian Mineralogist 81)

Strunz 9th edition incl. updates

8.AD.05

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
D: Mit ausschließlich großen [Kationen]
05:Nahpoit-Gruppe

Lapis Classification

VII/A.12-052

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
12: Sehr große Kationen: Ca-Na-K, SE, Bi u.a.

Classification by Hölzel

8.AD.400

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
D: Phosphates, C large

Dana 8th edition

37.01.05.01

37: Phosphate Minerals
01: Anhydrous Acid Phosphates, etc with miscellaneous formulae

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

max. Birefringence

0.050

Birefringence chart\! Nahpoite title=Birefringence chart Nahpoite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.480s

RI value β

1.500

RI value γ / ε

1.530

Ri mean

1.503

2V angle

Biaxial (+) 80°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

5.463

Cell parameters b (Å)

6.82

Cell parameters c (Å)

5.75

Cell parameters a/b or c/a

0.801

Cell parameters c/b

0.843

Cell parameters α

90°

Cell parameters β

122.5

Cell parameters γ

90°

Z

2

Volume (ų)

180.681

X-Ray Powder Diffraction

3.97(40),
3.84(50),
3.41(20),
2.868(30),
2.803(100),
2.720(70),
2.650(10),
2.440(10)

XRD chart Nahpoite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

1.5

VHN (Hardness Vickers)

18 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.58

2.609 ( ρ calc. Mineralienatlas )

Instability

+++ H2O, hygroskopisch -> Dorfmanit

Preface

Author (Name, Year)

Coleman & Robertson, 1981

References

Canadian Mineralogist 19 (1981), 373

Other languages

German

Nahpoit

English

Nahpoite

French

Nahpoite

Spanish

Nahpoíta

Russian

Нахпоит

CNMNC (IMA)-Number

IMA 1981-002

CNMNC symbol

Symbol

Nhp

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Yj6lYJE3qESAg75Rp3HTCQ
GUID (Global unique identifier) 60A53E62-3791-44A8-8083-BE51A771D309
Database ID 2655