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Niahite

Collectors Summary

Color hellorange, farblos
Streak color weiß
Hardness (Mohs) 1.5
Solubility +++ Säuren
Crystal System orthorhombisch, Pnm21

Chemism

Chemical formula

(NH4)(Mn2+,Mg,Ca)PO4·H2O

Chemical composition

Calcium, Magnesium, Mangan, Phosphor, Sauerstoff, Stickstoff, Wasserstoff

Unit weight: 175.28750114 u; Number of atoms in the formula: 14

Info

Empirical formula:

(NH4)(Mn0.6Mg0.3Ca0.1)PO4·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.45

6

42.86

1.0079470

6.0476820
Nitrogen

N

7.99

1

7.14

14.0067200

14.0067200
Oxygen

O

45.64

5

35.71

15.9994300

79.9971500
Magnesium

Mg

4.16

0.3

2.14

24.3050600

7.2915180
Phosphorus

P

17.67

1

7.14

30.9737612

30.9737612
Calcium

Ca

2.29

0.1

0.71

40.0784000

4.0078400
Manganese

Mn

18.81

0.6

4.29

54.9380499

32.9628299

Strunz 9th edition incl. updates

8.CH.20

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
H: Mit großen und mittelgroßen Kationen, RO4:H2O < 1:1
20:Dittmarit-Gruppe

Lapis Classification

VII/C.23-030

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
23: Mittelgroße und große Kationen: Fe-Mn-Zn-Mg und Ca-(NH4) 1+

Classification by Hölzel

8.CD.640

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
D: Phosphates, Valency: 1,2 for large, 2 for medsized Cations
6: With NH4+ Dittmarite-Group

Dana 8th edition

40.01.02.02

40: Hydrated Phosphates, etc
01: Hydrated Phosphates, etc where A++ B++ (XO4) · x(H2O)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellorange, farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.027
Birefringence chart\! Niahite title=Birefringence chart Niahite

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

1.582

RI value β

1.604

RI value γ / ε

1.609

Ri mean

1.598

2V angle

Biaxial (-) 54°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

31

Space Group

Pnm21

Cell parameters a (Å)

5.68

Cell parameters b (Å)

8.78

Cell parameters c (Å)

4.88

Cell parameters a/b or c/a

0.647

Cell parameters c/b

0.556

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

243.368

X-Ray Powder Diffraction

8.82(100),
4.79(50),
4.267(60),
3.412(40),
2.845(80),
2.832(90),
2.513(30),
2.300(40)
XRD chart Niahite

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

Crystals 3D

Open larger view

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)

2.39

2.392 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Malaysia/Sarawak/Miri-District/Niah Great Cave

Preface

Author (Name, Year)

Bridge & Robinson, 1983

References

Mineralogical Magazine 47 (1983), 79

Other languages

German

Niahit

Spanish

Niahita

French

Niahite

English

Niahite

Russian

Ниахит

Alternative Name

Japanese

ニアー石

CNMNC (IMA)-Number

IMA 1977-022

CNMNC symbol

Symbol

Nhi

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 8RFz5EPD0ECyN1_yh602dA
GUID (Global unique identifier) E47311F1-C343-40D0-B237-5FF287AD3674
Database ID 2733