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Akrochordite (Acrochordite)

Pictures (1 Images total)

Eveit mit Akrochordit
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Eveit mit Akrochordit
hellgrüne Kristalle von Eveit neben bräunlichem Akrochordit, Langban, Schweden; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt/Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte
Mineral: Akrochordite, Eveite
Image: 1582227552
License: Usage for Mineralienatlas project only
Eveit mit Akrochordit

hellgrüne Kristalle von Eveit neben bräunlichem Akrochordit, Langban, Schweden; BB < 1 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-20
Locality: Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte / Långban, Distrikt / Filipstad, Gemeinde / Värmland, Provinz / Schweden

Collectors Summary

Color rötlichbraun
Hardness (Mohs) 3.5
Solubility +++ H2SO4
Crystal System monoklin, P21/c

Chemism

Chemical formula

Mn4Mg(AsO4)2(OH)4·4H2O

Chemical composition

Arsen, Magnesium, Mangan, Sauerstoff, Wasserstoff

Unit weight: 661.9867076 u; Number of atoms in the formula: 35

Info

Empirical formula:

Mn4Mg(AsO4)2(OH)4·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.83

12

34.29

1.0079470

12.0953640

Oxygen

O

38.67

16

45.71

15.9994300

255.9908800

Magnesium

Mg

3.67

1

2.86

24.3050600

24.3050600

Manganese

Mn

33.20

4

11.43

54.9380499

219.7521996

Arsenic

As

22.64

2

5.71

74.9216020

149.8432040

Analysis wt%

MgO : 6.94, MnO : 38.98, As2O5 : 33.51, P2O5 : 0.42, H2O : 16.78, Na2O : 1.18, K2O : 0.55, CaO : 0.99, FeO : 0.46, Mn2O3 : 0.50 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

8.DD.10

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
D: Mit ausschließlich mittelgroßen [Kationen], (OH, etc.):RO4 = 2:1
10:Akrochordit-Gruppe

Lapis Classification

VII/D.16-030

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
16: Mittelgroße Kationen: Cu-Zn-Mn-Al-Fe

Classification by Hölzel

8.DB.200

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
B: Valency: 2, C medium

Dana 8th edition

42.04.01.01

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
04: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)5 (XO4)2 Zq · x(H2O)
01: Akrochordite Group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Akrochordite group

Optical Properties

Color

rötlichbraun

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.011

Birefringence chart\! Akrochordite title=Birefringence chart Akrochordite

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

1.672

RI value β

1.676

RI value γ / ε

1.683

Ri mean

1.677

2V angle

Biaxial (+) 70°!

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

5.682

Cell parameters b (Å)

17.627

Cell parameters c (Å)

6.832

Cell parameters a/b or c/a

0.322

Cell parameters c/b

0.388

Cell parameters α

90°

Cell parameters β

99.50

Cell parameters γ

90°

Z

2

Volume (ų)

674.886

X-Ray Powder Diffraction

8.79(80),
5.31(40),
4.40(100),
3.62(40),
3.112(40),
3.062(40),
2.750(50),
2.362(40)

XRD chart Akrochordite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.19 - 3.26 / Durchschnittlich = 3.22

3.257 ( ρ calc. Mineralienatlas )

Instability

+++ H2SO4

Preface

Author (Name, Year)

Flink, 1922

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 8

IMA group assignments


 
 
Mn4Mg(AsO4)2(OH)4·4H2O
monoklin
P21/c

 
 
Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2
monoklin
P21/c

 
 
Cu2Mn3(AsO4)2(OH)4(H2O)4
monoklin
P21/c

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Actuality: 22. Mar 2024 - 04:15:29

Other languages

Spanish

Acrocordita

German

Akrochordit

English

Akrochordite

French

Akrochordite

Russian

Акрохордит

Alternative Name

Achrochordit

Achrochordita

Achrochordite

Acrochordit

Acrochordita

Acrochordite

Akrochordita

CNMNC symbol

Symbol

Akr

Locations with GPS information

IDs

GUSID (Global unique identifier short form) tptJIFUNa0yGafgEob649w
GUID (Global unique identifier) 20499BB6-0D55-4C6B-8669-F804A1BEB8F7
Database ID 42