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Vránaite

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About VránaiteHide

Formula:
Al16B4Si4O38
The formula is close to Li1.08Be0.47Fe0.02Al14.65B3.89Si3.88O36.62
Crystal System:
Monoclinic
Related to boralsilite and boromullite.

Product of breakdown of spodumene.

Crystal structure details: chains of AlO6 octahedra, || [010], cross linked by disilicate groups; triangular BO3 groups; chains with AlO4 and two AlO5 polyhedra; partially occupied BO4 polyhedron.


Classification of VránaiteHide

Approved, Pending publication
Approval Year:
2015

Chemical Properties of VránaiteHide

Formula:
Al16B4Si4O38

The formula is close to Li1.08Be0.47Fe0.02Al14.65B3.89Si3.88O36.62

Crystallography of VránaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 10.3832(1) Å, b = 5.6682(7) Å, c = 10.823(1) Å
β = 90.11(1)°
Ratio:
a:b:c = 1.832 : 1 : 1.909
Unit Cell V:
636.98 ų (Calculated from Unit Cell)
Comment:
previously reported space group setting is I2/m

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.40(96)
5.19(99)
4.97(74)
3.658(75)
3.403(100)
2.496(61)
2.171(75)
1.518(61)

Type Occurrence of VránaiteHide

General Appearance of Type Material:
subparallel prisms, up to 100 μm long, intergrown
Place of Conservation of Type Material:
In the mineralogical collections of the Natural History Museum of Los Angeles County, California, USA, catalogue number 65609, and the Department of Mineralogy and Petrography, Moravian Museum,Brno, Czech Republic catalogue numbers B11277 and B11278
Geological Setting of Type Material:
elbaite-subtype pegmatite
Associated Minerals at Type Locality:

Synonyms of VránaiteHide

Other InformationHide

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

References for VránaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cempírek, J., Grew, E.S., Kampf, A.R., Ma, C., Novák, M., Gadas, P., Škoda, R., Vašinová-Galiová, M., Pezzotta, F. and Groat, L.A. (2015): A potentially new borosilicate mineral, ca. Al16B4Si4O38, related to boralsilite from the Manjaka pegmatite, Sahatany Valley, Madagascar. 2015 GSA Annual Meeting in Baltimore, Maryland, USA, abstract No. 196-6.
Cempírek, J.,Grew, E.S.,Kampf, A.R., Ma, C., Novák, M., Gadas, P., Škoda, R., Vašinová-Galiová, M., Pezzotta, F., Groat, L.A. (2016) Vránaite, IMA 2015-084. CNMNC Newsletter No. 29, February 2016, 200. Mineralogical Magazine: 80: 199–205.

Internet Links for VránaiteHide

Localities for VránaiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Madagascar (TL)
 
  • Antananarivo Province
    • Vakinankaratra Region
      • Antsirabe II District
        • Ibity Commune
          • Sahatany Valley
Cempírek, J.,Grew, E.S.,Kampf, A.R., Ma, C., Novák, M., Gadas, P., Škoda, R., Vašinová-Galiová, M., Pezzotta, F., and Groat, L.A., 2016. Vránaite, IMA 2015-084. CNMNC Newsletter No. 29, February 2016, 200; Mineralogical Magazine, 80, 199–205
Mineral and/or Locality  
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