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Shirozulite

Additional Functions

Collectors Summary

Color dunkel rötlichbraun
Lustre Perlmuttglanz
Hardness (Mohs) 3
Cleavages vollkommen (001)

Chemism

Chemical formula

K(Mn2+,Mg)3[(OH)2|AlSi3O10]

Chemical composition

Aluminium, Magnesium, Mangan, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 486.184899475 u; Number of atoms in the formula: 22

Info

Empirical formula:

K(Mn0.75Mg0.25)3[(OH)2AlSi3O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.41

2

9.09

1.0079470

2.0158940
Oxygen

O

39.49

12

54.55

15.9994300

191.9931600
Magnesium

Mg

3.75

0.75

3.41

24.3050600

18.2287950
Aluminium

Al

5.55

1

4.55

26.9815382

26.9815382
Silicon

Si

17.33

3

13.64

28.0855300

84.2565900
Potassium

K

8.04

1

4.55

39.0983100

39.0983100
Manganese

Mn

25.42

2.25

10.23

54.9380499

123.6106123

Analysis wt%

SiO2 : 31.40, TiO2 : 0.71, Al2O3 : 18.45, FeO : 2.90, MnO : 22.38, MgO : 7.83, BaO : 2.77, K2O : 8.75, H2O : 3.66 (Ref: American Mineralogist 2004)

Strunz 9th edition incl. updates

9.EC.20

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
20:Phlogopit-Gruppe

Lapis Classification

VIII/H.11-102

VIII: SILIKATE
H: Schichtsilikate
11: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Lithionit/Biotit-Reihe

Classification by Hölzel

9.ED.175

9: SILICATES
E: Phyllosilicates
D: Biotite-Group

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

Color

dunkel rötlichbraun

Lustre

Perlmuttglanz

max. Birefringence

0.043
Birefringence chart\! Shirozulite title=Birefringence chart Shirozulite

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

1.592

RI value β

1.635

RI value γ / ε

1.635

Ri mean

1.621

2V angle

Biaxial (-) v.sm.

Crystallography

Cell parameters a (Å)

5.379

Cell parameters b (Å)

9.319

Cell parameters c (Å)

10.292

Cell parameters a/b or c/a

0.577

Cell parameters c/b

1.104

Cell parameters α

90°

Cell parameters β

100.18

Cell parameters γ

90°

Z

2

Volumne (ų)

507.8

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

115 on 001

Density (g/cm³)

3.2

3.18 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (001)

(Co-)Type locality

(Co-)Type locality

Japan/Honshu/Chubu, Region/Aichi, Präfektur/Kitashitara, Landkreis/Shitara/Taguchi Mine

IMA group assignments

Other languages

Spanish

Shirozulita

French

Shirozulite

English

Shirozulite

German

Shirozulith

Russian

Широцулит

Alternative Name

Japanese

白水雲母

CNMNC (IMA)-Number

IMA 2001-045

CNMNC symbol

Symbol

Szu