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Rossmanite (Rossmanit)

Pictures (2 Images total)

Rossmanit
Views (File:
1498866541
): 1069
Rossmanit
Größe: 60x50x30 mm; Fundort: Dorothy China Clay Pit, St Austell District, Cornwall, England, UK
Copyright: Cornwall And Devon Minerals; Contribution: slugslayer
Location: UK/England/Cornwall Co./St. Austell District/St. Stephen-in-Brannel/Whitemoor/Dorothy China Clay Pit
Mineral: Rossmanite
Image: 1498866541
License: Usage for Mineralienatlas project only
Rossmanit

Größe: 60x50x30 mm; Fundort: Dorothy China Clay Pit, St Austell District, Cornwall, England, UK
Copyright: Cornwall And Devon Minerals
Contribution: slugslayer 2017-07-01
Locality: Dorothy China Clay Pit / Whitemoor / St. Stephen-in-Brannel / St. Austell District / Cornwall Co. / England / UK
Rossmanit
Views (File:
1626602561
): 304
Rossmanit
Tschechien/Hochland, Region (Kraj Vysočina)/Žd'ár nad Sázavou (Saar), Okres/Rožná (Roschna)/Rožná-Pegmatit. Bildbreite 6 mm
Copyright: Ulrich Baumgärtl; Contribution: Ulrich Baumgärtl
Collection: Ulrich Baumgärtl
Location: Tschechien/Hochland (Kraj Vysočina)/Žd'ár nad Sázavou (Saar), Okres/Rožná (Roschna)/Rožná-Pegmatit
Mineral: Rossmanite
Image: 1626602561
License: Usage for Mineralienatlas project only
Rossmanit

Tschechien/Hochland, Region (Kraj Vysočina)/Žd'ár nad Sázavou (Saar), Okres/Rožná (Roschna)/Rožná-Pegmatit. Bildbreite 6 mm
Collection: Ulrich Baumgärtl
Copyright: Ulrich Baumgärtl
Contribution: Ulrich Baumgärtl 2021-07-18
Locality: Rožná-Pegmatit / Rožná (Roschna) / Žd'ár nad Sázavou (Saar), Okres / Hochland (Kraj Vysočina) / Tschechien

Collectors Summary

Color rosa, blassrosa
Streak color weiß
Hardness (Mohs) 7
Cleavages keine
Fracture nicht genannt
Crystal System trigonal, R3m

Chemism

Chemical formula

Na<0.5(Al,Li,Mn2+)3Al6[(OH)4|(BO3)3|Si6O18]

Chemical composition

Aluminium, Lithium, Mangan, Natrium, Silicium, Bor, Sauerstoff, Wasserstoff

Analysis wt%

SiO2 : 38.10, Al2O3 : 44.60, Li2O : 1.13, Na2O : 1.43, B2O3 : 10.88, H2O : 3.70 (Ref: American Mineralogist 1998)

Strunz 9th edition incl. updates

9.CK.05

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
K: ~[Si6O18]12- sechser-Einfachringe, mit inselartig, komplexe [Anionen]
05:

Lapis Classification

VIII/E.19-005

VIII: SILIKATE
E: Ringsilikate
19: Sechserringe [Si6O18] 12-; Turmalin-Gruppe

Classification by Hölzel

9.CE.530

9: SILICATES
C: Cyclosilicates
E: Tourmaline-Group

Dana 8th edition

61.03a.01.03

61: Cyclosilicates Cyclosilicate Six-Membered Rings
03a: Cyclosilicates Cyclosilicate Six-Membered Rings with borate groups (Alkali-Deficient Tourmaline Subgroup)
01: Foitite Subgroup

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tourmaline supergroup  ⇒ X-vacant-Tourmaline group  ⇒ Tourmaline Vacant-subgroup 2

Optical Properties

Color

rosa, blassrosa

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.021
Birefringence chart\! Rossmanite title=Birefringence chart Rossmanite

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

1.645

RI value γ / ε

1.624

Ri mean

1.638

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

15.770

Cell parameters b (Å)

-

Cell parameters c (Å)

7.085

Cell parameters a/b or c/a

0.449

Cell parameters c/b

-

Z

3

Volumne (ų)

1525.927

X-Ray Powder Diffraction

6.314(30),
4.181(60),
3.950(100),
3.434(50),
2.924(60),
2.552(90),
2.019(30),
1.898(70)
XRD chart Rossmanite

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)

7

VHN (Hardness Vickers)

1650 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3

Cleavages

keine

Fracture

nicht genannt

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Tschechien/Hochland (Kraj Vysočina)/Žd'ár nad Sázavou (Saar), Okres/Rožná (Roschna)/Rožná-Pegmatit

Preface

Name from

George R. Rossman (geboren. August 3, 1944), California Institute of Technology, Pasadena, California, USA, in Anerkennung für seine Arbeiten der Spektroskopie von Turmalin-Supergruppe Mineralien

Author (Name, Year)

Selway & Novák & Hawthorne & Cerný & Ottolini & Kyser, 1998

References

American Mineralogist 83 (1998), 896

FERDINANDO BOSI, GIOVANNI B. ANDREOZZI, MARCELLA FEDERICO, GIORGIO GRAZIANI, AND SERGIO LUCCHESI - Crystal chemistry of the elbaite-schorl series - American Mineralogist, Volume 90, pages 1784-1792, 2005

IMA group assignments

Other languages

German

Rossmanit

Spanish

Rossmanita

French

Rossmanite

English

Rossmanite

Russian

Россманит

Alternative Name

Japanese

ロスマン電気石

CNMNC (IMA)-Number

IMA 1996-018

CNMNC symbol

Symbol

Rsm

Locations with GPS information