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Gebhardite

Collectors Summary

Color hellbraun
Streak color weiß
Hardness (Mohs) 3.5
Solubility +++ HCl, HNO3
Crystal System monoklin, P21/c

Chemism

Chemical formula

Pb8(As23+O5)2OCl6

Chemical composition

Arsen, Blei, Chlor, Sauerstoff

Unit weight: 2346.079338 u; Number of atoms in the formula: 29

Info

Empirical formula:

Pb8(As2O5)2OCl6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

7.50

11

37.93

15.9994300

175.9937300

Chlorine

Cl

9.07

6

20.69

35.4532000

212.7192000

Arsenic

As

12.77

4

13.79

74.9216020

299.6864080

Lead

Pb

70.66

8

27.59

207.2100000

1,657.6800000

Analysis wt%

PbO : 75.10, As2O3 : 16.70, Cl : 8.90 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 83)

Strunz 9th edition incl. updates

4.JB.50

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
J: Antimonite, Bismuthite, Sulfite, Selenite, Tellurite
B: [Arsenite], [Antimonite], [Bismuthite]; mit zusätzlichen [Anionen], ohne H20
50:Gebhardit-Gruppe

Lapis Classification

IV/J.06-040

IV: OXIDE
J: Arsenite (mit As3+)
6: Arsenite mit [As2O5] 4--Gruppen

Classification by Hölzel

5.JB.330

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
J: Arsenites
B: Arsenites (+Anions -Water)

Dana 8th edition

46.02.05.01

46: Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
02: Basic or Halogen-Containing Antimonites, Arsenites and Phosphites with miscellaneous formulae

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellbraun

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.04

Birefringence chart\! Gebhardite title=Birefringence chart Gebhardite

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

2.08

RI value β

2.106

RI value γ / ε

2.12

Ri mean

2.102

2V angle

Biaxial (-) 34°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

6.724

Cell parameters b (Å)

11.20

Cell parameters c (Å)

34.19

Cell parameters a/b or c/a

0.600

Cell parameters c/b

3.053

Cell parameters α

90°

Cell parameters β

85.20

Cell parameters γ

90°

Z

4

Volume (ų)

2565.778

X-Ray Powder Diffraction

6.70(100),
3.72(80),
3.68(80),
3.55(70),
3.15(70),
2.925(60),
2.839(50),
2.801(80)

XRD chart Gebhardite

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)

3.5

VHN (Hardness Vickers)

130

Density (g/cm³)

6

6.073 ( ρ calc. Mineralienatlas )

Instability

+++ HCl, HNO3

(Co-)Type locality

(Co-)Type locality

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

Preface

Author (Name, Year)

Medenbach & Gebert & Abraham, 1983

References

Neues Jahrbuch für Mineralogie, Monatshefte (1983), 445

Other languages

German

Gebhardit

Spanish

Gebhardita

English

Gebhardite

French

Gebhardite

Russian

Гебхардит

CNMNC (IMA)-Number

IMA 1979-071

CNMNC symbol

Symbol

Geb

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 8W0-z5VacUiBUzFn91jNNw
GUID (Global unique identifier) CF3E6DF1-5A95-4871-8153-3167F758CD37
Database ID 1348