Bazzite Mineral Data

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General Bazzite Information

Chemical Formula:

Be3(Sc,Al)2Si6O18

Composition:

Molecular Weight = 564.46 gm

Scandium 11.95 % Sc 18.32 % Sc₂O₃

Beryllium 4.79 % Be 13.29 % BeO

Aluminum 2.39 % Al 4.52 % Al₂O₃

Silicon 29.85 % Si 63.87 % SiO₂

Oxygen 51.02 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Be₃Sc_1.5Al_0.5Si₆O₁₈

Environment:

Pegmatites and alpine-vein rocks.

IMA Status:

Valid Species (Pre-IMA) 1915

Locality:

Lake Maggiore, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after the Italian engineer, A. E. Bazzi.

Synonym:

ICSD 90829

PDF 20-165

Bazzite Image

Images:

Bazzite

Comments: Blue crystals of bazzite.
Location: Thiemendorf near K?nigshain, Lausitz, Sachsen, Germany. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Bazzite Crystallography

Axial Ratios:

a:c = 1:0.9626

Cell Dimensions:

a = 9.521, c = 9.165, Z = 2; V = 719.50 Den(Calc)= 2.61

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc

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

By Intensity(I/I_o): 2.94(1), 3.29(1), 1.65(0.8),

Crystal Structure:

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Demartin F , Gramaccioli C M , Pilati T , The Canadian Mineralogist , 38 (2000) p.1419-1424, Structure refinement of bazzite from pegmatitic and miarolitic occurrences, Locality: Baveno granite, Piemonte, Italy

View Additional jPOWD Structure files for Bazzite
[1]

Physical Properties of Bazzite

Cleavage:

[0001] Indistinct

Color:

Azure blue, Dark blue.

Density:

2.8

Diaphaniety:

Translucent to subtranslucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6.5 - Pyrite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

pale bluish white

Optical Properties of Bazzite

Dichroism (e):

pale greenish yellow.

Dichroism (w):

azure blue.

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2358,KPDmeas= 0.2198,KC= 0.2212

Optical Data:

Uniaxial (-), e=1.605, w=1.626, bire=0.0210.

Calculated Properties of Bazzite

Electron Density:

r_electron=2.76 gm/cc
note: r_Bazzite=2.80 gm/cc.

Fermion Index

Fermion Index = 0.06208
Boson Index = 0.93792

Photoelectric:

PE_Bazzite= 2.93 barns/electron
U=PE_Bazzite x r_electron= 8.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bazzite is Not Radioactive

Bazzite Classification

Dana Class:

61.1.1.2 (61)Cyclosilicate Six-Membered Rings

(61.1)with [Si6O18] rings; possible (OH) and Al substitution

(61.1.1)Beryl group

61.1.1.1 Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m

61.1.1.2 Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m

61.1.1.3 Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m

61.1.1.4 Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]·2(H2O) P 6/mmc 6/m 2/m 2/m

61.1.1.5 Pezzottaite! Cs(Be2Li)Al2Si6O18 R 3c 3m

Strunz Class:

VIII/E.12-20 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.12 - Beryl series

VIII/E.12-10 Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m

VIII/E.12-20 Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m

VIII/E.12-25 Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]·2(H2O) P 6/mmc 6/m 2/m 2/m

VIII/E.12-30 Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m

VIII/E.12-40 Cordierite Mg2Al4Si5O18 C ccm 2/m 2/m 2/m

VIII/E.12-50 Sekaninaite (Fe,Mg)2Al4Si5O18 C ccm 2/m 2/m 2/m

Other Bazzite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Bazzite

Be3(Sc,Al)2Si6O18
Dana No: 61.1.1.2 Strunz No: VIII/E.12-20
Locality:

Notes: