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Gaitite (Gaitit)

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Gaitit
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Gaitit
Aggregat von gelbem Gaitit, Tsumeb Mine, Tsumeb, Namibia; BB < 1 mm, analysiert
Copyright: mintreasure.com; Contribution: openpit
Location: Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine
Mineral: Gaitite
Image: 1642969696
License: Usage for Mineralienatlas project only
Gaitit

Aggregat von gelbem Gaitit, Tsumeb Mine, Tsumeb, Namibia; BB < 1 mm, analysiert
Copyright: mintreasure.com
Contribution: openpit 2022-01-23
Locality: Tsumeb Mine / Tsumeb / Oshikoto (Otjikoto), Region / Namibia

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 5
Solubility +++ Säuren
Crystal System triklin, P1

Chemism

Chemical formula

Ca2Zn(AsO4)2·2H2O

Chemical composition

Arsen, Calcium, Zink, Sauerstoff, Wasserstoff

Unit weight: 459.435492 u; Number of atoms in the formula: 19

Info

Empirical formula:

Ca2Zn(AsO4)2·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.88

4

21.05

1.0079470

4.0317880
Oxygen

O

34.82

10

52.63

15.9994300

159.9943000
Calcium

Ca

17.45

2

10.53

40.0784000

80.1568000
Zinc

Zn

14.24

1

5.26

65.4094000

65.4094000
Arsenic

As

32.61

2

10.53

74.9216020

149.8432040

Analysis wt%

As2O5 : 50.20, CaO : 24.20, ZnO : 15.30, MgO : 1.20, H2O : 7.80 (Ref: Canadian Mineralogist 80)

Strunz 9th edition incl. updates

8.CG.05

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
G: Mit großen und mittelgroßen Kationen, RO4:H2O = 1:1
05:Fairfieldit-Gruppe

Lapis Classification

VII/C.17-060

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

Classification by Hölzel

8.CD.840

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
D: Phosphates, Valency: 1,2 for large, 2 for medsized Cations
8: very large: 2, large/medium=2/1, triclinic Messelite-Group

Dana 8th edition

40.02.02.06

40: Hydrated Phosphates, etc
02: Hydrated Phosphates, etc where A++ (B++)2 (XO4) · x(H2O)
02: Fairfieldite Subgroup (Triclinic: P-1¯)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.035
Birefringence chart\! Gaitite title=Birefringence chart Gaitite

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

1.713

RI value β

1.730

RI value γ / ε

1.748

Ri mean

1.730

2V angle

Biaxial (+) 88°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

5.90

Cell parameters b (Å)

7.61

Cell parameters c (Å)

5.57

Cell parameters a/b or c/a

0.775

Cell parameters c/b

0.732

Cell parameters α

111.67

Cell parameters β

70.83

Cell parameters γ

119.42

Z

1

Volumne (ų)

199.076

X-Ray Powder Diffraction

5.05(40),
3.581(40),
3.350(50),
3.208(50),
3.080(80),
2.781(100),
2.750(70),
1.721(60)
XRD chart Gaitite

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)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.81

3.832 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Namibia/Oshikoto (Otjikoto), Region/Tsumeb/Tsumeb Mine

Type material

Archiv der Universität Stuttgart, "Mineralogische Sammlung Prof. Keller"

Collection number of type material

ST-78/47 / 0/824-s27/2

Paragenesis of type material

Koritnigit, O'Danielit

Preface

Author (Name, Year)

Sturman & Dunn, 1980

References

Canadian Mineralogist 18 (1980), 197

Other languages

German

Gaitit

Spanish

Gaitita

English

Gaitite

French

Gaitite

Russian

Гаитит

Russian

Гейтит

CNMNC (IMA)-Number

IMA 1978-047

CNMNC symbol

Symbol

Gt

Locations with GPS information