Carobbiite Mineral Data

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General Carobbiite Information

Chemical Formula:

Composition:

Molecular Weight = 58.10 gm

Potassium 67.30 % K 81.07 % K₂O

Fluorine 32.70 % F 32.70 % F

- % F -13.77 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Environment:

Stalactites in cavities in lava.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Vesuvius, Campania, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Guido Carobbi (1900-1983), Italian geologist, Institute of Mineralogy and Geochemistry, University of Florence, Florence, Italy, who collected the first specimens.

Synonym:

ICSD 64686

PDF 36-1458

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Carobbiite Crystallography

Cell Dimensions:

a = 5.34, Z = 4; V = 152.27 Den(Calc)= 2.53

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.671(1), 1.89(0.63), 3.087(0.29),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, rocksalt structure

Physical Properties of Carobbiite

Cleavage:

{???} Good

Color:

Colorless.

Density:

2.524

Diaphaneity:

Transparent

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Carobbiite

Optical Data:

Isotropic, n=1.362.

Calculated Properties of Carobbiite

Electron Density:

Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Carobbiite =2.53 gm/cc.

Fermion Index:

Fermion Index = 0.0000807584
Boson Index = 0.9999192416

Photoelectric:

PE_Carobbiite= 7.03 barns/electron
U=PE_Carobbiite x r_electron= 17.14 barns/cc.

Radioactivity:

GRapi = 935.96 (Gamma Ray American Petroleum Institute Units)
Concentration of Carobbiite per GRapi unit =1,068.43 (PPM)

**Estimated Radioactivity from Carobbiite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 9.11 cm	20,391	5.51E-07	935.96	0.31
100 gm / 4.23 cm	2,039	5.51E-08	93.60	0.03
10 gm / 1.96 cm	204	5.51E-09	9.36	0.00
1 gm / 9.11 mm	20	5.51E-10	0.94	0.00
0.1 gm / 4.23 mm	2	5.51E-11	0.09	0.00
0.01 gm / 1.96 mm	0	5.51E-12	0.01	0.00
0.001 gm / 0.91 mm	0	5.51E-13	0.00	0.00

Weight of pure Carobbiite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.53 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Carobbiite Classification

Dana Class:

09.01.01.04 (09)Anhydrous and Hydrated Halides

(09.01)where A X

(09.01.01)Halite Group

09.01.01.01 Halite NaCl F m3m 4/m 3 2/m

09.01.01.02 Sylvite KCl F m3m 4/m 3 2/m

09.01.01.03 Villiaumite NaF F m3m 4/m 3 2/m

09.01.01.04 Carobbiite KF F m3m 4/m 3 2/m

09.01.01.05 Griceite LiF F m3m 4/m 3 2/m

Strunz Class:

03.AA.20 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AA -M:X = 1:1, 2:3, 3:5, etc.

03.AA.20 Carobbiite KF F m3m 4/m 3 2/m

03.AA.20 Griceite LiF F m3m 4/m 3 2/m

03.AA.20 Halite NaCl F m3m 4/m 3 2/m

03.AA.20 Sylvite KCl F m3m 4/m 3 2/m

03.AA.20 Villiaumite NaF F m3m 4/m 3 2/m

Other Carobbiite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Carobbiite

KF
Dana No: 09.01.01.04 Strunz No: 03.AA.20
Locality:

Notes: