Girasol

Big Photo

Ethiopia
6.28 carats
© Kosnar Gem Co.

A bluish-white translucent variety of Common opal showing reddish reflections. The name derived from the Latin "gyro" - to turn and "sol" - sun, and dates back to at least 15th century Europe.

Girasol Gemstones by Colour

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

Girasol Gemstones by Size

This table shows distribution of Girasol 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:6.28 cts
Heaviest:6.80 cts
Average:6.54 cts
Total photos:2
Do you have a larger Girasol? Why not upload a photo?
6.28ct to 6.33ct6.33ct to 6.38ct6.38ct to 6.44ct6.44ct to 6.49ct6.49ct to 6.54ct6.54ct to 6.59ct6.59ct to 6.64ct6.64ct to 6.70ct6.70ct to 6.75ct6.75ct to 6.80ct
General Information
A variety or type of:Common Opal, which is a variety of Opal
Chemical Formula
SiO
 
2
· nH
 
2
O
Walter Schumann, Gemstones of the world (2001)
Physical Properties of Girasol
Mohs Hardness5.5 to 6.5
Walter Schumann, Gemstones of the world (2001)
Specific Gravity1.98 to 2.50
Walter Schumann, Gemstones of the world (2001)
TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityNone
Walter Schumann, Gemstones of the world (2001)
FractureConchoidal,Splintery
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Girasol
Refractive Index1.37 to 1.52
Walter Schumann, Gemstones of the world (2001)
BirefringenceNone
Walter Schumann, Gemstones of the world (2001)
PleochroismAbsent
Walter Schumann, Gemstones of the world (2001)
DispersionNone
Walter Schumann, Gemstones of the world (2001)
Colour
Colour (General)Almost colourless with bluish opalescence
Walter Schumann, Gemstones of the world (2001)
TransparencyTransparent,Translucent
Walter Schumann, Gemstones of the world (2001)
Crystallography of Girasol
Crystal SystemAmorphous
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Girasol information at mindat.org
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