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Grossite

Collectors Summary

Color farblos, weiß
Streak color weiß
Crystal System monoklin, C2/c

Chemism

Chem­ical formula

CaAl4O7

Chem­ical com­po­si­tion

Aluminium, Calcium, Sauerstoff

Unit weight: 260.0005628 u; Number of atoms in the formula: 12

Info

Empirical formula:

CaAl4O7

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

43.08

7

58.33

15.9994300

111.9960100

Aluminium

Al

41.51

4

33.33

26.9815382

107.9261528

Calcium

Ca

15.41

1

8.33

40.0784000

40.0784000

Anal­y­sis wt%

Ø Al2O3 : 77.80, CaO : 21.40 (Ref: European Journal of Mineralogy 89)

Strunz 9th edi­tion incl. updates

4.CC.15

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
C: Metall: Sauerstoff = 2: 3,3: 5, und vergleichbare
C: Mit großen und mittelgroßen Kationen
15:Grossit-Gruppe

Lapis Clas­sifica­tion

IV/B.09-010

IV: OXIDE
B: Oxide mit Verhältnis Metall zu Sauerstoff = 3:4 (Spinelltyp M3O4 und verwandte Verbindungen)

Clas­sifica­tion by Hölzel

4.CE.760

4: OXIDES
C: R2O3 Sesquioxides
E: Other complex Oxides, mostly hextrig
7: Brownmillerite-Group

Dana 8th edi­tion

07.03.02.01

07: Multiple Oxides
03: Multiple Oxides with 2+ and higher charged cations

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

max. Birefrin­gence

0.034

Birefringence chart\! Grossite title=Birefringence chart Grossite

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

1.618

RI value β

1.618

RI value γ / ε

1.652

Ri mean

1.629

2V angle

Biaxial (+) 12°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell param­e­ters a (Å)

12.94

Cell param­e­ters b (Å)

8.910

Cell param­e­ters c (Å)

5.446

Cell param­e­ters a/b or c/a

1.452

Cell param­e­ters c/b

0.611

Cell param­e­ters α

90°

Cell param­e­ters β

107.0

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

600.463

X-Ray Pow­der Diffrac­tion

4.460(40),
3.609(10),
3.515(100),
2.882(10),
2.605(40),
2.543(10),
2.440(20),
1.764(20)

XRD chart Grossite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.88

2.876 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Israel/Negev-Wüste/Hatrurim-Formation

Type mate­r­ial

Institut für Planetologie, Westfälischen Wilhelms-Universität

Par­a­ge­n­e­sis of type mate­r­ial

Perovskit, Hibonit, Melilith, Spinell

Preface

Author (Name, Year)

Weber & Bischoff, 1994

References

European Journal of Mineralogy 6 (1994), 591

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

Grossite

CaAl4O7

monoklin : 2/m : C2/c

4.CC.15

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

Dmitryivanovite

CaAl2O4

monoklin : 2/m : P21/c

IV/B.09-005

Krotite

CaAl2O4

monoklin : 2/m : P21/n

IV/B.09-007

Grossite

CaAl4O7

monoklin : 2/m : C2/c

IV/B.09-010

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

Brownmillerite

Ca2(Al,Fe3+)2O5

orthorhombisch : mm2 : Ibm2

4.CE.700

Srebrodolskite

Ca2Fe23+O5

orthorhombisch : mmm : Pnma

4.CE.710

Shulamitite

Ca3TiFe3+AlO8

orthorhombisch : mmm : Pmma

4.CE.730

Chlormayenite

Ca12Al14O32[☐4Cl2]

kubisch : 43m : I43d

4.CE.740

'Brearleyite'

Ca12Al14O32Cl2

kubisch : 43m : I43d

4.CE.745

Dmitryivanovite

CaAl2O4

monoklin : 2/m : P21/c

4.CE.750

Krotite

CaAl2O4

monoklin : 2/m : P21/n

4.CE.755

Grossite

CaAl4O7

monoklin : 2/m : C2/c

4.CE.760

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Welinite

Mn32+(W6+,Mg)0.7SiO4(O,OH)3

trigonal : 3 : P3

07.03.01.01

Franciscanite

Mn2+6V5+(SiO4)2(O,OH)6

trigonal : 3 : P3

07.03.01.02

Örebroite

Mn2+6(Fe3+,Sb5+)2(SiO4)2(O,OH)6

trigonal : 3 : P3

07.03.01.03

Grossite

CaAl4O7

monoklin : 2/m : C2/c

07.03.02.01

Fernandinite

(Ca,Na,K)0.9(V5+,V4+,Fe2+,Ti)8O20·4H2O

monoklin : 2/m : C2/m

07.03.02.03

Eyselite

Fe3+Ge4+3O7(OH)

07.03.03.01

CNMNC (IMA)-Number

IMA 1993-052

CNMNC symbol

Symbol

Gss

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

German pages

DeWikiPedia - search for: Grossit
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English pages

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American-Mineralogist-Crystal-Structure-Database - search for: Grossite
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Russian pages

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German pages

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