Bazzite (original) (raw)

A valid IMA mineral species - grandfathered

About BazziteHide

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Colour:

Deep blue or other shades of blue, blue-green.

Specific Gravity:

2.77 - 2.8

Name:

Named in 1915 for Alessandro Eugenio Bazzi (1892-1929), discoverer of the mineral.

The scandium analogue of Beryl.

Typically found as small to tiny hexagonal crystals with a deep blue or blue-green color. Hard to distinguish from beryl.
The blue colour is caused by appreciable iron contents, and, more specifically, the intensity of the blue colour by the ratio between Fe2+ and Fe3+ (Taran et al., 2017).

A Cs-bearing variety is known (see Caesian Bazzite).
Taran et al. (2017) report few chemical varieties, slightly differing in Fe admixture content (Telemark, Norway) and Fe (up to 6.73 wt.% FeO), Mn (up to 2.98 wt.% MnO), Mg (up to 1.86 wt.% MgO) and Al admixture/content (Kent, Kazakhstan). The oxidation state of Fe is variable. The presence of water molecules trapped in structural channels was confirmed, the molecules being always located between or near to the 6-membered rings having Na atoms in their centres.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:586:1

dc7ef081-9922-4970-a823-52b85b777626

IMA Classification of BazziteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Be3(Sc,Fe3+,Mg)2Si6O18 · Na0.32 · nH2O

Classification of BazziteHide

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9.CJ.05

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions

61.1.1.2

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of BazziteHide

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Transparency:

Transparent, Translucent

Colour:

Deep blue or other shades of blue, blue-green.

Comment:

The blue colour is caused by appreciable iron contents, and, more specifically, the ratio between

Fe#2#+ and Fe#3#+

(Taran et al., 2017).

Cleavage:

Poor/Indistinct
Poor on {0001}.

Fracture:

Irregular/Uneven

Density:

2.77 - 2.8 g/cm3 (Measured) 2.82 g/cm3 (Calculated)

Optical Data of BazziteHide

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RI values:

_n_ω = 1.622 - 1.637 _n_ε = 1.602 - 1.622

δ = 0.020

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

O = pale greenish yellow
E = intense sky-blue

Chemistry of BazziteHide

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Mindat Formula:

Be3Sc2(Si6O18)

Common Impurities:

Fe,Mn,Mg,Li,Na,K,Rb,Cs

Chemical AnalysisHide

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Empirical formulas:

Crystallography of BazziteHide

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Class (H-M):

6/m m m _(_6/_m_2/_m_2/m ) - Dihexagonal Dipyramidal

Cell Parameters:

a = 9.521 (5) Å, c = 9.165(5) Å

Unit Cell V:

719.50 ų (Calculated from Unit Cell)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

Found in miarolitic cavities in granites, granite pegmatites and in Alpine veins associated with pegmatitic minerals.

Type Occurrence of BazziteHide

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Place of Conservation of Type Material:

Municipal Museum of Natural History, Milan, Italy.
University of Milan, Milan, Italy.
The Natural History Museum, London, England, 1925,534.
Natural History Museum, Paris, France, 115.132.

Geological Setting of Type Material:

Other Language Names for BazziteHide

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Simplified Chinese:钪绿柱石

Traditional Chinese:鈧綠柱石

Varieties of BazziteHide

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Relationship of Bazzite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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IR Spectrum:

Water type II molecules (H–H vector perpendicular to the c-axis) are only observed in samples from Kent (Kazakhstan); H2O IId type is indicated by the bands at 1621 and 3663 cm−1, while the ones at 1633 and 3643 are indicative for th

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for BazziteHide

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References for BazziteHide

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Reference List:

Armbruster, Th., Libowitzky, E., Auernhammer, M., Bauerhansl, P., Hoffmann, Ch., Irran, E., Kurka, A., Rosenstingl, H., Diamond, L. (1995) Crystal chemistry and optics of bazzite from Furkabasistunnel (Switzerland) Mineralogy and Petrology, 52 (1) 113-126 doi:10.1007/bf01163130

Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.). Wiley-Interscience. p.1872

Gramaccioli, C. M., Diella, V., Demartin, F., Orlandi, P., Campostrini, I. (2000) Cesian bazzite and thortveitite from Cuasso al Monte, Varese, Italy: A comparison with the material from Baveno, and inferred origin. The Canadian Mineralogist, 38 (6) 1409-1418 doi:10.2113/gscanmin.38.6.1409

Taran, Michail N., Dyar, M. Darby, Khomenko, Vladimir M., Boesenberg, Joseph S. (2017) Optical absorption, Mössbauer, and FTIR spectroscopic studies of two blue bazzites. Physics and Chemistry of Minerals, 44 (7) 497-507 doi:10.1007/s00269-017-0877-2

Localities for BazziteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.