Sellaite

Big Photo

Brazil
3.68 carats
© Rarestone.com

Sellaite is named after Quintino Sella, Italian mining engineer and mineralogist.

Sellaite forms short prismatic yellowish, colourless or white transparent crystals. Facetable material comes from Bahia, Brazil.
3 photos

Sellaite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Sellaite Gemstones by Size

This table shows distribution of Sellaite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.29 cts
Heaviest:3.68 cts
Average:2.22 cts
Total photos:3
Do you have a larger Sellaite? Why not upload a photo?
1.29ct to 1.53ct1.53ct to 1.77ct1.77ct to 2.01ct2.01ct to 2.25ct2.25ct to 2.49ct2.49ct to 2.72ct2.72ct to 2.96ct2.96ct to 3.20ct3.20ct to 3.44ct3.44ct to 3.68ct
General Information
Chemical Formula
MgF
 
2
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Physical Properties of Sellaite
Mohs Hardness5 to 5.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity3.14 to 3.16
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureConchoidal
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Sellaite
Refractive Index1.378 to 1.390
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterUniaxial/-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.010 to 0.012
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Colour
Colour (General)Colourless
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent,Translucent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Sellaite
Crystal SystemTetragonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitPrismatic
Michael O’Donoghue, Gems, Sixth Edition (2006)
Geological Environment
Where found:Facetable crystals occur in a metamorphic magnesite deposit.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Sellaite information at mindat.org
Significant Gem Localities
Brazil
 
  • Bahia
    • Brumado
      • Serra das Éguas
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 448
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