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.

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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Photos of natural/un-cut material from mindat.org
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 (Bom Jesus dos Meiras)
      • Serra das Éguas
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 448
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