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Holdawayite (Holdawayit)

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Holdawayit
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Holdawayit
gestreiftes, schwarzes Aggregat von Holdawayit, Kombat Mine, Grootfontein, Namibia; BB ~ 3 mm, analysiert
Copyright: mintreasure.com; Contribution: openpit
Location: Namibia/Otjozondjupa, Region/Grootfontein, Kreis/Kombat Mine
Mineral: Holdawayite
Image: 1675538000
License: Usage for Mineralienatlas project only
Holdawayit

gestreiftes, schwarzes Aggregat von Holdawayit, Kombat Mine, Grootfontein, Namibia; BB 3 mm, analysiert

Copyright: mintreasure.com
Contribution: openpit 2023-02-04
Locality: Kombat Mine / Grootfontein, Kreis / Otjozondjupa, Region / Namibia

Collectors Summary

Color dunkelrosa
Streak color hellrosa
Hardness (Mohs) 3
Solubility +++ HCl
Crystal System monoklin, C2/m

Chemism

Chemical formula

Mn62+(CO3)2(OH)7(Cl,OH)

Chemical composition

Chlor, Mangan, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 599.53982265 u; Number of atoms in the formula: 29.25

Info

Empirical formula:

Mn6(CO3)2(OH)7(Cl0.75(OH)0.25)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.22

7.25

24.79

1.0079470

7.3076158

Carbon

C

4.01

2

6.84

12.0107800

24.0215600

Oxygen

O

35.36

13.25

45.30

15.9994300

211.9924475

Chlorine

Cl

4.44

0.75

2.56

35.4532000

26.5899000

Manganese

Mn

54.98

6

20.51

54.9380499

329.6282994

Analysis wt%

MgO : 4.40, MnO : 64.60, CaO : 0.50, B2O3 : 1.20, CO2 : 14.20, H2O : 11.47, Cl : 4.40 (Ref: American Mineralogist 88)

Strunz 9th edition incl. updates

5.BA.20

5: Carbonate (Carbonate, Nitrate)
B: Carbonate mit weitere Anionen, ohne H2O
A: Mit [Cu], [Co], [Ni], [Zn], [Mg], [Mn]
20:Holdawayit-Gruppe

Lapis Classification

V/C.06-040

V: NITRATE, CARBONATE UND BORATE
C: Wasserfreie Carbonate, mit fremden Anionen

Classification by Hölzel

5.BA.420

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
B: Carbonates (+Anions -Water)
A: With small-medium cations, V=2
4: Sclarite-Group

Dana 8th edition

16b.04.02.02

16b: Carbonates - Hydroxyl or Halogen
04: Carbonates - Hydroxyl or Halogen where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=8:1

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkelrosa

Streak color

hellrosa

max. Birefringence

0.077

Birefringence chart\! Holdawayite title=Birefringence chart Holdawayite

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

1.644

RI value β

1.719

RI value γ / ε

1.721

Ri mean

1.695

2V angle

Biaxial (-) 12°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

23.437

Cell parameters b (Å)

3.314

Cell parameters c (Å)

16.618

Cell parameters a/b or c/a

7.072

Cell parameters c/b

5.014

Cell parameters α

90°

Cell parameters β

111.15

Cell parameters γ

90°

Z

4

Volume (ų)

1203.779

X-Ray Powder Diffraction

10.93(100),
7.77(40),
5.459(80),
3.879(70),
2.926(40),
2.690(60),
2.589(50),
1.789(70)

XRD chart Holdawayite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.19 (gemessen)

3.308 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

Preface

Author (Name, Year)

Peacor & Essene & Rouse & Dunn & Nelen & Grice & Innes & von Knorring,

References

American Mineralogist 73 (1988), 632

Other languages

German

Holdawayit

Spanish

Holdawayita

French

Holdawayite

English

Holdawayite

Russian

Холдавейит

Russian

Холдауэйит

CNMNC (IMA)-Number

IMA 1986-001

CNMNC symbol

Symbol

Hdw

Locations with GPS information

IDs

GUSID (Global unique identifier short form) ShftxMXUzEaZJx3DZ7wDtw
GUID (Global unique identifier) C4ED174A-D4C5-46CC-9927-1DC367BC03B7
Database ID 1616