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Strontiomelane

Additional Functions

Collectors Summary

Color grau color in Öl
Streak color sepia braun
Hardness (Mohs) 5
Cleavages rarely
Fracture keiner
Crystal System monoklin, P21/c

Chemism

Chemical formula

Sr(Mn4+6Mn3+2)O16

Chemical composition

Mangan, Strontium, Sauerstoff

Unit weight: 783.1162792 u; Number of atoms in the formula: 25

Info

Empirical formula:

Sr(Mn6Mn2)O16

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

32.69

16

64.00

15.9994300

255.9908800
Manganese

Mn

56.12

8

32.00

54.9380499

439.5043992
Strontium

Sr

11.19

1

4.00

87.6210000

87.6210000

Analysis wt%

SiO2 : 0.45, TiO2 : 0.53, MnO2 : 59.93, Mn2O3 : 16.81, Fe2O3 : 5.24, BaO : 1.73, SrO : 12.15, K2O : 0.89 (Ref: Canadian Mineralogist 99)

Strunz 9th edition incl. updates

4.DK.05a

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
K: Mit großen (± mittelgroßen) [Kationen]; Tunnelstrukturen
05a:Coronadit-Gruppe

Lapis Classification

IV/D.08-025

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)
8: Kryptomelan-Gruppe

Classification by Hölzel

4.DE.205

4: OXIDES
D: Dioxides
E: Pyrolusite-Group

Dana 8th edition

07.09.01.05

07: Multiple Oxides
09: Multiple Oxides
01: Cryptomelane Group (Hard black, fine-grained)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Hollandite supergroup  ⇒ Coronadite group

Optical Properties

Color

grau color in Öl

Streak color

sepia braun

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

10.00

Cell parameters b (Å)

5.758

Cell parameters c (Å)

9.88

Cell parameters a/b or c/a

1.737

Cell parameters c/b

1.716

Cell parameters α

90°

Cell parameters β

90.63

Cell parameters γ

90°

Z

2

Volume (ų)

568.856

X-Ray Powder Diffraction

4.96(30),
3.52(30),
3.50(30),
3.15(100),
3.13(80),
2.409(80),
2.229(40),
2.170(60)
XRD chart Strontiomelane

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

398 (100g)

Density (g/cm³)

4.66 (berechnet)

4.572 ( ρ calc. Mineralienatlas )

Cleavages

rarely

Fracture

keiner

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Italien/Aostatal (Valle d'Aosta), Region/Saint-Marcel/Mina Praborna

Preface

Author (Name, Year)

Meisser & Perseil & Brugger & Chiappero, 1999

References

Canadian Mineralogist 37 (1999), 673

European Journal of Mineralogy Volume 25 Number 1 (2013), p. 85 - 90

IMA group assignments

Other languages

Spanish

Estronciomelana

German

Strontiomelan

English

Strontiomelane

French

Strontiomelane

Traditional Chinese

黑錳鍶礦

Simplified Chinese

黑锰锶矿

Japanese

ｽﾄﾛﾝﾁｵ黒柘榴石

Alternative Name

Japanese

ストロンチオメレン

CNMNC (IMA)-Number

IMA 1995-005

CNMNC symbol

Symbol

Sml

IDs

GUSID (Global unique identifier short form) nte3tXQb1EuqFAvdlPKHnQ
GUID (Global unique identifier) B5B7D79E-1B74-4BD4-AA14-0BDD94F2879D
Database ID 3672