Brizziite-VII Mineral Data

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General Brizziite-VII Information

Chemical Formula:

NaSb+++++O3

Composition:

Molecular Weight = 192.74 gm

Sodium 11.93 % Na 16.08 % Na₂O

Antimony 63.17 % Sb 88.07 % SbO₃

Oxygen 24.90 % O

______ ______

100.00 % 104.15 % = TOTAL OXIDE

Empirical Formula:

NaSbO₃

Environment:

The result of deep weathering of stibnite.

IMA Status:

Approved IMA 1992

Locality:

The Cetine mine, approximately 20 km SW of Sienna, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

For Dr. Giancarlo Brizzi (1936-1992) who discovered the mineral.

Name Pronunciation:

Brizziite-VII + Pronunciation

Synonym:

IMA1993-044

Brizziite-VII Image

Images:

Click Here for Larger Brizziite-VII Image

Brizziite-VII Brizziite-III

Comments: Colorless thin hexagonal plates of brizziite. Brizzite-VII and brizzite-III are the same mineral with different Dana classification numbers.
Location: Le Cetine di Cotorniano, Chiusdino, Siena Province, Tuscany, Italy. Scale: See Image.
© Rruff Database

Brizziite-VII Crystallography

Axial Ratios:

a:c = 1:3.00547

Cell Dimensions:

a = 5.301, c = 15.932, Z = 6; V = 387.72 Den(Calc)= 4.95

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 1.874(1), 1.471(0.69), 2.365(0.69),

Physical Properties of Brizziite-VII

Cleavage:

{001} Perfect

Color:

Yellow, Pale pink.

Density:

4.8 - 4.95, Average = 4.87

Diaphaneity:

Transparent

Fracture:

Unknown - Minerals too small to observe fractures.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2 - Gypsum

Luster:

Pearly

Streak:

white

Optical Properties of Brizziite-VII

Gladstone-Dale:

CI meas= -3.939 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -3.864 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1486,KPDmeas= 0.1509,KC= 0.0305
Ncalc = 1.15

Optical Data:

Uniaxial (-), e=1.631, w=1.84, bire=0.2090.

Calculated Properties of Brizziite-VII

Electron Density:

Bulk Density (Electron Density)=4.42 gm/cc
note: Specific Gravity of Brizziite-VII =4.95 gm/cc.

Fermion Index:

Fermion Index = 0.0001195361
Boson Index = 0.9998804639

Photoelectric:

PE_{Brizziite-VII}= 208.40 barns/electron
U=PE_{Brizziite-VII} x rElectron Density= 920.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brizziite-VII is Not Radioactive

Brizziite-VII Classification

Dana Class:

44.03.12.01 (44)Antimonates

(44.03)with miscellaneous formulae

(44.03.12)Dana Group

44.03.12.01 Brizziite-VII NaSbO3 R 3 3

Strunz Class:

04.CB.05 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.CB -With medium-sized cations

04.CB.05 Auroantimonate* AuSbO3 Ortho ? Ortho

04.CB.05 Geikielite MgTiO3 R 3 3

04.CB.05 Brizziite-III NaSbO3 R 3 3

04.CB.05 Brizziite-VII NaSbO3 R 3 3

04.CB.05 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

04.CB.05 Corundum Al2O3 R 3c 3 2/m

04.CB.05 Eskolaite Cr2O3 R 3c 3 2/m

04.CB.05 Hematite Fe2O3 R 3c 3 2/m

04.CB.05 Karelianite V2O3 R 3c 3 2/m

04.CB.05 Ilmenite FeTiO3 R 3 3

04.CB.05 Melanostibite Mn(Sb,Fe)O3 R 3 3

04.CB.05 Pyrophanite MnTiO3 R 3 3

04.CB.05 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig

04.CB.05 Tistarite! Ti2O3 R 3c 3 2/m

Other Brizziite-VII Information

References:

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

See Also:

Links to other databases for Brizziite-VII :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Brizziite-VII Specimen Label here :

Brizziite-VII

NaSb+++++O3
Dana No: 44.03.12.01 Strunz No: 04.CB.05
Locality:

Notes: