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Allactite (Allactit)

Pictures (2 Images total)

Allaktit
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Allaktit

Fundort: Moss Mine, Nordmark, Filipstad, Värmland, Schweden; Bildbreite: 3 mm

Copyright: Christian Rewitzer
Contribution: Klinoklas 2007-11-23
Locality: Mossgruvan (Moss Mine) / Ljusnarsberg / Örebro, Provinz / Schweden
Allaktit xx
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Allaktit xx

Östra Mossgruvan,Nordmark,Filipstad/Värmland,Schweden; Bildbreite ca.4 mm

Collection: Haubi
Copyright: Haubi
Contribution: Haubi 2018-01-07
Locality: Nordmark (Nordmarksberg) / Filipstad, Gemeinde / Värmland, Provinz / Schweden

Collectors Summary

Color bräunlichrot, rosarot, farblos bis weiß
Streak color grau zu schwach braun
Lustre Glasglanz, schwacher Fettglanz auf Bruchflächen
Hardness (Mohs) 4.5
Cleavages ausgeprägt {001}
Fracture uneben
Solubility +++ Säuren
Crystal System monoklin, P21/a

Chemism

Chem­ical formula

Mn2+7(AsO4)2(OH)8

Chem­ical com­po­si­tion

Arsen, Mangan, Sauerstoff, Wasserstoff

Unit weight: 798.4640093 u; Number of atoms in the formula: 33

Info

Empirical formula:

Mn7(AsO4)2(OH)8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.01

8

24.24

1.0079470

8.0635760

Oxygen

O

32.06

16

48.48

15.9994300

255.9908800

Manganese

Mn

48.16

7

21.21

54.9380499

384.5663493

Arsenic

As

18.77

2

6.06

74.9216020

149.8432040

Anal­y­sis wt%

MnO : 62.23, FeO : 0.49, As2O5 : 28.19, H2O : 8.99 (Ref: Dana, 7th ed. 2)

Strunz 9th edi­tion incl. updates

8.BE.30

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
E: Mit ausschließlich mittelgroßen [Kationen] (OH, etc.):RO4 > 2:1
30:Allaktit-Gruppe

Lapis Clas­sifica­tion

VII/B.15-050

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
15: Mittelgroße Kationen: Mg-Mn-Fe-Cu-Zn

Clas­sifica­tion by Hölzel

8.BD.200

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
D: Phosphates, C medium, V: 2, OH/XO4 ò 3/1

Dana 8th edi­tion

41.02.01.01

41: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
02: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A B)7 (XO4)2 Zq
01: Allactite Group

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Allactite group

Optical Properties

Color

bräunlichrot, rosarot, farblos bis weiß

Streak color

grau zu schwach braun

Diaphane­ity (Trans­parency)

durchscheinend

Lus­tre

Glasglanz, schwacher Fettglanz auf Bruchflächen

max. Birefrin­gence

0.019

Birefringence chart\! Allactite title=Birefringence chart Allactite

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

α = 1.755 - 1.761

RI value β

β = 1.772 - 1

RI value γ / ε

γ = 1.774 - 1.787

Ri mean

1.767

2V angle

Biaxial (-) 0°~ (geemssen)

Ori­enta­tion

Y = b; X ∧ c = 51°

Dis­per­sion

stark; r > v

Pleochro­ism

X = blutrot; Y = hellgelb; Z= See-grün

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell param­e­ters a (Å)

11.03

Cell param­e­ters b (Å)

12.12

Cell param­e­ters c (Å)

5.509

Cell param­e­ters a/b or c/a

0.910

Cell param­e­ters c/b

0.455

Cell param­e­ters α

90°

Cell param­e­ters β

114.10

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

672.269

Kristall struc­ture

G. Diego Gatta, Ferdinando Bosi, Maria Teresa Fernandez Diaz, Ulf Hålenius: H-bonding scheme in allactite: a combined single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, FTIR and EPMA-WDS study. Mineral Mag. Vol. 80 (2016) S. 719-732.

X-Ray Pow­der Diffrac­tion

4.95(40),
3.71(60),
3.39(40),
3.28(50),
3.23(50),
3.06(100),
2.929(50),
2.506(40)

XRD chart Allactite

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)

4.5

VHN (Hard­ness Vick­ers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.94 (berechnet) 3.83 (gemessen)

3.944 ( ρ calc. Mineralienatlas )

Cleav­ages

ausgeprägt {001}

Frac­ture

uneben

Tenac­ity

spröde

Insta­bil­ity

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Schweden/Örebro, Provinz/Ljusnarsberg/Mossgruvan (Moss Mine)

Par­a­ge­n­e­sis of type mate­r­ial

Synadelphit, Hematolit, Hausmannit, Pyrochroit, Fluorit

Preface

Asso­cia­tions

Pyroaurit, Leucophoenicit, Hodgkinsonit, Adelit, Franklinit, Willemit, Friedelit, Caryopilit, Sphalerit, Fluorit, Baryt, Calcit, Serpentin, Chlorit (Franklin, New Jersey, USA).

Name from

1884 benannt von Stens Anders Sjogren Hjalmar und abgeleitet vom griechischen Wort αλλάκτειν ("allaktein"), "zu ändern", in Anspielung auf seine markanten Pleochroismus.

Author (Name, Year)

Sjögren, 1884

References

Sjögren - Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm 109 (1884) (als Allaktit).

Palache, C., Berman, H., & Frondel, C. - The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp. (1951) 785-787.

Dunn, P.J. - Allactite from Franklin and Sterling Hill, New Jersey. Mineralogical Record, 14 (1983), 251–252

Handbook of Mineralogy (Anthony et al.), 4 (2000), 12

Moore, Paul B., - Crystal Chemistry of the Basic Manganese Arsenate Minerals, American Mineralogist, 53 (1968) 733-741.

IMA group assignments

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

Allactite

Mn2+7(AsO4)2(OH)8

monoklin : 2/m : P21/a

8.BE.30

Argandite

Mn7(VO4)2(OH)8

monoklin : 2/m : P21/n

8.BE.30

Flinkite

Mn2+2Mn3+(AsO4)(OH)4

orthorhombisch : mmm : Pnma

8.BE.30

Raadeite

Mg7[(OH)4|PO4]2

monoklin : 2/m : P21/n

8.BE.30

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

Flinkite

Mn2+2Mn3+(AsO4)(OH)4

orthorhombisch : mmm : Pnma

VII/B.15-010

Retzian-(La)

(Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4

orthorhombisch : mmm : Pban

VII/B.15-020

Retzian-(Ce)

Mn2Ce(AsO4)(OH)4

orthorhombisch : mmm : Pban

VII/B.15-030

'Retzian-(Nd)'

Mn2(Nd,Ce,La)(AsO4)(OH)4

orthorhombisch : mmm : Pban

VII/B.15-040

Raadeite

Mg7[(OH)4|PO4]2

monoklin : 2/m : P21/n

VII/B.15-045

Waterhouseite

Mn7(PO4)2(OH)8

monoklin : 2/m : P21/c

VII/B.15-048

Allactite

Mn2+7(AsO4)2(OH)8

monoklin : 2/m : P21/a

VII/B.15-050

Argandite

Mn7(VO4)2(OH)8

monoklin : 2/m : P21/n

VII/B.15-060

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

Allactite

Mn2+7(AsO4)2(OH)8

monoklin : 2/m : P21/a

8.BD.200

Waterhouseite

Mn7(PO4)2(OH)8

monoklin : 2/m : P21/c

8.BD.205

Raadeite

Mg7[(OH)4|PO4]2

monoklin : 2/m : P21/n

8.BD.210

Argandite

Mn7(VO4)2(OH)8

monoklin : 2/m : P21/n

8.BD.230

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

Allactite

Mn2+7(AsO4)2(OH)8

monoklin : 2/m : P21/a

41.02.01.01

Raadeite

Mg7[(OH)4|PO4]2

monoklin : 2/m : P21/n

41.02.01.02

Waterhouseite

Mn7(PO4)2(OH)8

monoklin : 2/m : P21/c

41.02.01.03

Heyite

Pb5Fe22+(VO4)2O4

monoklin : 2/m : P21/m

41.02.02.01

Other languages

Spanish

Alactita

English

Allactite

French

Allactite

German

Allaktit

Russian

Аллактит

Russian

Альфорсит

Simplified Chinese

砷水锰矿

Alternative Name

German

Allactit

Spanish

Allactita

Spanish

Allaktita

Allaktite

English

Chloroarsenian

Elfstorpite

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Альфорсит

Mineral Dealer

German pages

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Locations with GPS information




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