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Akatoreite (Akatoreit)

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Akatoreit
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Akatoreit
gelbbraune,leistenfärmige Aggregate von Akatoreit, Monte Maniglia, Cuneo, Piedmont, Italien; BB ~ 5 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Italien/Piemont (Piemonte), Region/Cuneo, Provinz/Dora-Maira-Massiv/Val Varaita/Bellino/Monte Maniglia Mine
Mineral: Akatoreite
Image: 1613585866
License: Usage for Mineralienatlas project only
Akatoreit

gelbbraune,leistenfärmige Aggregate von Akatoreit, Monte Maniglia, Cuneo, Piedmont, Italien; BB 5 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2021-02-17
Locality: Monte Maniglia Mine / Bellino / Val Varaita / Dora-Maira-Massiv / Cuneo, Provinz / Piemont (Piemonte), Region / Italien

Collectors Summary

Color orange, braun
Streak color gelb weiß
Hardness (Mohs) 6
Crystal System triklin, P1

Chemism

Chemical formula

Mn2+9Al2Si8O24(OH)8

Chemical composition

Aluminium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 1293.1351015 u; Number of atoms in the formula: 59

Info

Empirical formula:

Mn9Al2Si8O24(OH)8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.62

8

13.56

1.0079470

8.0635760
Oxygen

O

39.59

32

54.24

15.9994300

511.9817600
Aluminium

Al

4.17

2

3.39

26.9815382

53.9630764
Silicon

Si

17.38

8

13.56

28.0855300

224.6842400
Manganese

Mn

38.24

9

15.25

54.9380499

494.4424491

Analysis wt%

SiO2 : 36.40, Al2O3 : 8.30, FeO : 1.00, MnO : 47.70, H2O : 6.21 (Ref: American Mineralogist 71)

Strunz 9th edition incl. updates

9.BH.15

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
H: Gruppen(Soro)-Silikate mit Si3O10 oder größeren Anionen; Kationen in tetrahedraler [4] und größerer Koordination
15:Akatoreit-Gruppe

Lapis Classification

VIII/C.35-020

VIII: SILIKATE
C: Gruppensilikate
35: Sonstige Gruppensilikate

Classification by Hölzel

9.BQ.350

9: SILICATES
B: Sorosilicates
Q: Si3O10 + SiO4-Group

Dana 8th edition

57.02.03.01

57: Sorosilicates Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
02: Sorosilicates Sorosilicate Insular Si3O10 and Larger Noncyclic Groups with [Si4O13] groups
03: Akatoreite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

orange, braun

Streak color

gelb weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.022
Birefringence chart\! Akatoreite title=Birefringence chart Akatoreite

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

1.698

RI value β

1.704

RI value γ / ε

1.720

Ri mean

1.707

2V angle

Biaxial (+) 66°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

8.344

Cell parameters b (Å)

10.358

Cell parameters c (Å)

7.627

Cell parameters a/b or c/a

0.806

Cell parameters c/b

0.736

Cell parameters α

104.48

Cell parameters β

93.47

Cell parameters γ

103.95

Z

1

Volumne (ų)

614.277

X-Ray Powder Diffraction

9.681(60),
4.665(100),
3.466(50),
3.310(90),
3.063(50),
2.85(50),
2.704(50),
2.214(80)
XRD chart Akatoreite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.48

3.495 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Neuseeland/South Island/Otago, Region/Dunedin/Akatore Creek

Preface

Author (Name, Year)

Read & Reay, 1971

References

American Mineralogist 56 (1971), 416

Other languages

German

Akatoreit

English

Akatoreite

French

Akatoreite

Spanish

Akatoreíta

Latvian

Akatoreīts

Russian

Акатореит

CNMNC (IMA)-Number

IMA 1969-015

CNMNC symbol

Symbol

Akt

Locations with GPS information