Grossite Mineral Data

General Grossite Information

Chemical Formula:

CaAl4O7

Composition:

Molecular Weight = 260.00 gm

Calcium 15.41 % Ca 21.57 % CaO

Aluminum 41.51 % Al 78.43 % Al₂O₃

Oxygen 43.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₄O₇

Environment:

Argillaceous limestones metamorphosed at high temperature and low pressure.

IMA Status:

Approved IMA 1994

Locality:

Hatrurim Fm, Israel. Link to MinDat.org Location Data.

Name Origin:

Named for Shulamit Gross (1923- ), Geological Survey of Israel, Jerusalem, Israel, who noted the species in the Hatrurim Formation, Israel.

Name Pronunciation:

Grossite

Synonym:

ICSD 27264

IMA1993-052

PDF 46-1475

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Grossite Crystallography

Axial Ratios:

a:b:c =1.4523:1:0.6112

Cell Dimensions:

a = 12.94, b = 8.91, c = 5.446, Z = 4; beta = 107.01° V = 600.43 Den(Calc)= 2.88

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.515(1), 4.46(0.43), 2.605(0.36),

Crystal Structure:

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Boyko E R , Wisnyi L G , Acta Crystallographica , 11 (1958) p.444-445, The optical properties and structures of CaO*2Al2O3 and SrO*2Al2O3, Locality: synthetic

Physical Properties of Grossite

Color:

Colorless, White.

Density:

2.88

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Grossite

Gladstone-Dale:

CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2185,KPDmeas= 0.2185,KC= 0.2076
Ncalc = 1.6

Optical Data:

Biaxial (+), a=1.6178, b=1.6184, g=1.6516, bire=0.0338, 2V(Calc)=16, 2V(Meas)=15.5.

Calculated Properties of Grossite

Electron Density:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Grossite =2.88 gm/cc.

Fermion Index:

Fermion Index = 0.0004148588
Boson Index = 0.9995851412

Photoelectric:

PE_Grossite= 3.12 barns/electron
U=PE_Grossite x rElectron Density= 8.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grossite is Not Radioactive

Grossite Classification

Dana Class:

07.03.02.01 (07)Multiple Oxides

(07.03)with 2+ and higher charged cations

(07.03.02)Dana Group

07.03.02.01 Grossite CaAl4O7 C 2/c 2/m

Strunz Class:

04.CC.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CC -With large and medium-sized cations

04.CC.15 Grossite CaAl4O7 C 2/c 2/m

Other Grossite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,1990)

See Also:

Links to other databases for Grossite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Grossite Specimen Label here :

Grossite

CaAl4O7
Dana No: 07.03.02.01 Strunz No: 04.CC.15
Locality:

Notes: