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Cossaite

Collectors Summary

Color farblos
Streak color weiß
Fracture unregelmäßig, uneben
Crystal System trigonal, R3

Chemism

Chem­ical formula

(Mg0.5,◻)Al6(SO4)6(HSO4)F6·36H2O

Chem­ical com­po­si­tion

Aluminium, Magnesium, Fluor, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1610.0343297 u; Number of atoms in the formula: 156.5

Info

Empirical formula:

(Mg0.5,◻)Al6(SO4)6(HSO4)F6·36H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

4.57

73

46.65

1.0079470

73.5801310

Oxygen

O

63.60

64

40.89

15.9994300

1,023.9635200

Fluorine

F

7.08

6

3.83

18.9984033

113.9904195

Magnesium

Mg

0.75

0.5

0.32

24.3050600

12.1525300

Aluminium

Al

10.06

6

3.83

26.9815382

161.8892292

Sulfur

S

13.94

7

4.47

32.0655000

224.4585000

Anal­y­sis wt%

SO3 : 34.70, Al2O3 : 19.50, MgO : 1.40, F : 5.70, H2O : 40.85 (Ref: Mineralogical Magazine 2011)

Strunz 9th edi­tion incl. updates

9.EC.15

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

Clas­sifica­tion by Hölzel

7.DJ.300

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
D: Sulfates (+Anions +Water)
J: Serpierite-Group

IMA sta­tus

anerkannt, IMA WEB-Seite, Neue Mineralien Juli 2009

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphane­ity (Trans­parency)

durchscheinend

RI value α / ω / n

1.49

Ri mean

1.49

2V angle

Biaxial

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3

Space Group number

146

Space Group

R3

Cell param­e­ters a (Å)

22.010

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

9.238

Cell param­e­ters a/b or c/a

0.420

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

3875.687

Kristall struc­ture

neuer Strukturtyp

X-Ray Pow­der Diffrac­tion

10.997(50), 4.584(25), 4.152(100), 3.873(70), 2.770(20), 2.345(17), 2.166(20)

XRD chart Cossaite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.08 (gemessen) 2.075 (brechnet)

2.069 ( ρ calc. Mineralienatlas )

Frac­ture

unregelmäßig, uneben

Tenac­ity

spröde

Preface

Name from

Alfonso Cossa (1833-1902)

Author (Name, Year)

Francesco Demartin, 2009

References

IMA WEB-Seite, Neue Mineralien Juli 2009

Campostrini, I., Demartin, F. & Gramaccioli, C.M. - Vulcano: ein außergewöhnlicher Fundpunkt von neuen und seltenen Mineralien. Mineralien-Welt 21 (2010) (3), 40-57

Demartin, F., Gramaccioli, C.M., Campostrini, I. & Castellano, C. - Cossaite, (Mg0.5,◻)Al6(SO4)6(HSO4)F6.36H2O, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine 75 (2011), 2847-2855.

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

'Sericite' (Var.v. Muscovite)

9.EC.15

Ganterite

(Ba,Na,K)(Al,Mg)2[(OH,F)2|(Al,Si)Si2O10]

monoklin : 2/m : C2/c

9.EC.15

Muscovite

KAl2(Si3Al)O10(OH,F)2

monoklin : 2/m : C2/c

9.EC.15

Tobelite

(NH4,K)Al2(Si3Al)O10(OH)2

monoklin : 2/m : C2/m

9.EC.15

'Glauconite'

(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

monoklin : 2/m : C2/m

9.EC.15

Montdorite

KMn0.52+Fe1.52+Mg0.5[F2|Si4O10]

monoklin : 2/m : C2/m

9.EC.15

Nanpingite

CsAl2(Si,Al)4O10(OH,F)2

monoklin : 2/m : C2/c

9.EC.15

Paragonite

NaAl2(Si3Al)O10(OH)2

monoklin : 2/m : C2/c

9.EC.15

Celadonite

K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2

monoklin : 2 : C2

9.EC.15

Chernykhite

BaV2(Si2Al2)O10(OH)2

monoklin : 2/m : C2/c

9.EC.15

Roscoelite

K(V,Al,Mg)2AlSi3O10(OH)2

monoklin : 2/m : C2/m

9.EC.15

Tainiolite

KLiMg2Si4O10F2

monoklin : 2/m : C/2m

9.EC.15

Voloshinite

Rb(LiAl1.50.5)(Al0.5Si3.5)O10F2

monoklin : C2/c

9.EC.15

Cossaite

(Mg0.5,◻)Al6(SO4)6(HSO4)F6·36H2O

trigonal : 3 : R3

9.EC.15

'Muscovite-1M' (Pol.v. Muscovite)

KAl2(Si3Al)O10(OH,F)2

monoklin : 2/m : C2/m

9.EC.15

'Muscovite-2A' (Pol.v. Muscovite)

KAl2(Si3Al)O10(OH,F)2

triklin : 1 : C1

9.EC.15

'Boromuscovite'

KAl2(Si3B)O10(OH,F)2

monoklin : 2/m : C2/m

9.EC.15

Chromphyllite

K(Cr,Al)2[(OH,F)2|AlSi3O10]

monoklin : 2/m : C2/c

9.EC.15

'Muscovite-3T' (Pol.v. Muscovite)

KAl2(Si3Al)O10(OH,F)2

trigonal : 32 : P3112

9.EC.15

'Muscovite-2M2' (Pol.v. Muscovite)

KAl2(Si3Al)O10(OH,F)2

monoklin : 2/m

9.EC.15

Chromceladonite

KMgCr[(OH)2|Si4O10]

monoklin : 2 : C2

9.EC.15

Ferroceladonite

K(Fe2+,Mg)(Fe3+,Al)[(OH)2|Si4O10]

monoklin : 2/m : C2/m

9.EC.15

Aluminoceladonite

K(Mg,Fe2+)Al[(OH)2|Si4O10]

9.EC.15

Manganiceladonite

KMgMn3+Si4O10(OH)2

monoklin : 2/m, 2 : C2, C2/m

9.EC.15

'Zweiaxiger glimmer'

KAl2(Si,Al)4O10(OH)2

9.EC.15

Ferroaluminoceladonite

K(Fe2+,Mg)(Al,Fe3+)[(OH)2|Si4O10]

monoklin : 2/m : C2/m

9.EC.15

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

Cossaite

(Mg0.5,◻)Al6(SO4)6(HSO4)F6·36H2O

trigonal : 3 : R3

7.DJ.300

Other languages

German

Cossait

Spanish

Cossaita

English

Cossaite

Alternative Name

Na-Al-Fluorosulfat

IMA Number

IMA 2009-031

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

German pages

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

English pages

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

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Cossait
Crystal-Treasure.com - search for: Cossait
Bosse - search for: Cossait

Locations with GPS information