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Geigerite (Geigerit)

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Geigerit xx
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Geigerit xx
Fundort: Mine Monte Nero, La Spezia, Ligurien, Italien; Bildbreite: 6 mm
Copyright: loismin; Contribution: loismin
Location: Italien/Ligurien (Liguria), Region/La Spezia, Provinz/Rocchetta Vara/Monte Nero
Mineral: Geigerite
Image: 1162130446
Rating: 3 (votes: 1)
License: Usage for Mineralienatlas project only
Geigerit xx

Fundort: Mine Monte Nero, La Spezia, Ligurien, Italien; Bildbreite: 6 mm
Copyright: loismin
Contribution: loismin 2006-10-29
Locality: Monte Nero / Rocchetta Vara / La Spezia, Provinz / Ligurien (Liguria), Region / Italien

Collectors Summary

Color rot, farblos
Streak color weiß
Hardness (Mohs) 3.25
Solubility +++ Säuren
Crystal System triklin, P1

Chemism

Chemical formula

Mn5(H2O)8(AsO3OH)2(AsO4)2·2H2O

Chemical composition

Arsen, Mangan, Sauerstoff, Wasserstoff

Unit weight: 1012.5366715 u; Number of atoms in the formula: 57

Info

Empirical formula:

Mn5(H2O)8(AsO3OH)2(AsO4)2·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.19

22

38.60

1.0079470

22.1748340
Oxygen

O

41.08

26

45.61

15.9994300

415.9851800
Manganese

Mn

27.13

5

8.77

54.9380499

274.6902495
Arsenic

As

29.60

4

7.02

74.9216020

299.6864080

Strunz 9th edition incl. updates

8.CE.05

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
E: Mit ausschließlich mittelgroßen Kationen, RO4:H2O = 1:2.5
05:Chudobait-Gruppe

Lapis Classification

VII/C.06-060

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
6: Kleine und mittelgroße Kationen: Be und Al-Mn-Fe-Cu-Zn-Mg

Classification by Hölzel

8.CD.170

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
D: Phosphates, Valency: 1,2 for large, 2 for medsized Cations
1: very large: 1, large/medium=2/5 Hureaulite-Group

Dana 8th edition

39.02.06.02

39: Hydrated Acid Phosphates, etc
02: Hydrated Acid Phosphates, etc H2 (AB)5 (XO4)4 · x(H2O)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

rot, farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.059
Birefringence chart\! Geigerite title=Birefringence chart Geigerite

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

1.601

RI value β

1.630

RI value γ / ε

1.660

Ri mean

1.630

2V angle

Biaxial (-) 89°c

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

7.944

Cell parameters b (Å)

10.691

Cell parameters c (Å)

6.770

Cell parameters a/b or c/a

0.743

Cell parameters c/b

0.633

Cell parameters α

80.97

Cell parameters β

84.20

Cell parameters γ

81.85

Z

1

Volume (ų)

560.281

X-Ray Powder Diffraction

10.45(100),
7.85(10),
4.89(10),
3.507(20),
3.340(20),
3.051(20),
3.011(20),
2.786(10)
XRD chart Geigerite

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)

3.25

VHN (Hardness Vickers)

115 (50g)

Density (g/cm³)

3.05

3.001 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Schweiz/Graubünden, Kanton/Albula, Region/Surses, Gemeinde/Tinizong-Rona (Tinzen)/Falotta

Preface

Author (Name, Year)

Graeser & Schwander & Bianchi & Pilati & Gramaccioli, 1989

References

American Mineralogist 74 (1989), 676

Other languages

German

Geigerit

Spanish

Geigerita

English

Geigerite

French

Geigerite

Russian

Гейгерит

CNMNC (IMA)-Number

IMA 1985-028

CNMNC symbol

Symbol

Ggr

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 6eK3YYreHk-rnQeI57CCAw
GUID (Global unique identifier) 61B7E2E9-DE8A-4F1E-AB9D-0788E7B08203
Database ID 1353