Pollucite

Pollucite is named after Pollux, twin brother of Castor in classical mythology, in allusion to its ultimate association with the mineral "castorite", now renamed as petalite.

Pollucite forms transparent colourless cubes, dodecahedra or trapezohedra and it may also occur as fine-grained masses.

Pollucite is a rare gem material.

Pollucite Gemstones by Colour

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

Pollucite Gemstones by Size

This table shows distribution of Pollucite 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:0.42 cts
Heaviest:49.05 cts
Average:7.23 cts
Total photos:18
Do you have a larger Pollucite? Why not upload a photo?
0.42ct to 5.28ct5.28ct to 10.15ct10.15ct to 15.01ct15.01ct to 19.87ct19.87ct to 24.74ct24.74ct to 29.60ct29.60ct to 34.46ct34.46ct to 39.32ct39.32ct to 44.19ct44.19ct to 49.05ct
General Information
Chemical Formula
(Cs,Na)(AlSi
 
2
O
 
6
) · 0.5H
 
2
O
Walter Schumann, Gemstones of the world (2001)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Pollucite
Mohs Hardness6.5 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity2.86 to 2.94
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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TenacityBrittle
Arthur Thomas, Gemstones (2009)
Cleavage QualityNone
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Pollucite
Refractive Index1.517 to 1.525
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterIsotropic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Dispersion0.014
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Colourless, grey, white, bluish, violet.
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)May react orange to pink
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Crystallography of Pollucite
Crystal SystemIsometric
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitCubes,dodecahedra or trapezohedra, commonly striate and it may also occur as fine-grained masses
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Pollucite occurs in lithium-rich granite pegmatites.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Pollucite information at mindat.org
Significant Gem Localities
Afghanistan
 
  • Kunar
    • Chapa Dara District
E.Ya. Kievlenko, Geology of gems, 2003, p. 110
  • Nuristan
    • Du Ab District
      • Nilaw-Kolum pegmatite field
E.Ya. Kievlenko, Geology of gems, 2003, p. 110
Italy
 
  • Tuscany
    • Livorno Province
      • Elba Island
        • Campo nell'Elba
USA
 
  • Maine
    • Oxford Co.
      • Newry
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 438
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 438
Copyright © Jolyon & Katya Ralph 1993-2019. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.