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Akrochordite (Acrochordita)

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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 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

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

Volumne (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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Akrochordite

Mn4Mg(AsO4)2(OH)4·4H2O

monoklin : 2/m : P21/c

8.DD.10

Guanacoite

Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2

monoklin : 2/m : P21/c

8.DD.10

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Luetheite

CuAl(AsO4)(OH)2

monoklin : 2/m : P21/m

VII/D.16-010

Chenevixite

CuFe3+(AsO4)(OH)2

monoklin : 2 : B21

VII/D.16-020

Guanacoite

Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2

monoklin : 2/m : P21/c

VII/D.16-025

Akrochordite

Mn4Mg(AsO4)2(OH)4·4H2O

monoklin : 2/m : P21/c

VII/D.16-030

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Akrochordite

Mn4Mg(AsO4)2(OH)4·4H2O

monoklin : 2/m : P21/c

8.DB.200

Guanacoite

Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2

monoklin : 2/m : P21/c

8.DB.220

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Akrochordite

Mn4Mg(AsO4)2(OH)4·4H2O

monoklin : 2/m : P21/c

42.04.01.01

Guanacoite

Cu2Mg2(Mg0.5Cu0.5)(OH)4(H2O)4(AsO4)2

monoklin : 2/m : P21/c

42.04.01.02

Morinite

NaCa2Al2(PO4)2(F,OH)5·2H2O

monoklin : 2/m : P21/m

42.04.02.01

Esperanzaite

NaCa2Al2[F2|OH|(AsO4)2]·2H2O

monoklin : 2/m : P21/m

42.04.02.02

Tyrolite

Ca2Cu9(AsO4)4(OH)8(CO3)(H2O)11·1-2H2O

monoklin : 2/m : P2/c

42.04.03.01

Dumontite

Pb2(UO2)3O2(PO4)2·5H2O

monoklin : 2/m : P21/m

42.04.05.01

Hügelite

Pb2(UO2)3(AsO4)2(OH)4·3H2O

monoklin : 2/m : P21/m

42.04.05.02

Bergenite

Ca2Ba4(UO2)9O6(PO4)6·16H2O

monoklin : 2/m : P21/c

42.04.05.03

Phuralumite

Al2[(UO2)3(PO4)2O(OH)](OH)3(H2O)9

monoklin : 2/m : P21/a

42.04.06.01

Phurcalite

Ca2(UO2)3O2(PO4)2·7H2O

orthorhombisch : mmm : Pbca

42.04.07.01

Phosphuranylite

KCa(H3O)3(UO2)7(PO4)4O4·8H2O

orthorhombisch : mmm : Cmcm

42.04.08.01

Arsenuranylite

Ca(UO2)4(AsO4)2(OH)4·6H2O

orthorhombisch : mmm : Bmmb

42.04.09.01

'Kivuite'

(Th,Ca,Pb)(UO2)4(PO3OH)2(OH)8·7(H2O)

42.04.09.03

Other languages

Spanish

Acrocordita

German

Akrochordit

English

Akrochordite

French

Akrochordite

Russian

Акрохордит

Alternative Name

Achrochordit

Achrochordita

Achrochordite

Acrochordit

Acrochordita

Acrochordite

Akrochordita

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Akrochordit
Google-Bilder-Suche - search for: Akrochordit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Akrochordit

English pages

Mindat - search for: Akrochordite
Webmineral - search for:Akrochordite
Handbook-of-Mineralogy - search for: Akrochordite
RRUFF - Raman, XRD and other mineral data - search for: Akrochordite
RRUFF - References and PDF downloads - search for: Akrochordite
American-Mineralogist-Crystal-Structure-Database - search for: Akrochordite
Athena - search for: Akrochordite

Russian pages

Webmineral.ru - search for: Акрохордит

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Akrochordit
Bosse - search for: Akrochordit

Locations with GPS information




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