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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

Volume (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/Südbezirk (Mechos haDarom)/Tamar Regional Council (Mo'atza Ezorit Tamar)

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

Other languages

German

Grossit

Spanish

Grossita

French

Grossite

English

Grossite

Russian

Гроссит

CNMNC (IMA)-Number

IMA 1993-052

CNMNC symbol

Symbol

Gss

Locations with GPS information

IDs

GUSID (Global unique identifier short form) GD6t9iZmtECtfUE0KysfXA
GUID (Global unique identifier) F6AD3E18-6626-40B4-AD7D-41342B2B1F5C
Database ID 1460