Topazolite

Big Photo

Russia
0.91 carats
© Giovanni Scapin 2015

Yellow, yellow-green, lemon yellow, yellow-brown in color, topaz-like (therefore the name) and sometimes of high enough quality to be cut into a faceted gemstone.
General Information
A variety or type of:Andradite, which is a variety of Garnet Group
Chemical Formula
Ca
 
3
Fe
 
2
(SiO
 
4
)
 
3
Arthur Thomas, Gemstones (2009)
Photos of natural/un-cut material from mindat.org
Physical Properties of Topazolite
Mohs Hardness6.5 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Specific Gravity3.70 to 4.10
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityNone
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Topazolite
Refractive Index1.855 to 1.895
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Optical CharacterIsotropic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Dispersion0.057
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Yellow, yellow-brown
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Causes of ColourYellow, various charge transfer processes and dispersed ion absorption involving Fe and Ti.
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTransparent,Translucent
Arthur Thomas, Gemstones (2009)
LustreSubadamantine,Vitreous
Arthur Thomas, Gemstones (2009)
Crystallography of Topazolite
Crystal SystemIsometric
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
HabitDodecahedral, trapezohedral
Arthur Thomas, Gemstones (2009)
Further Information
Mineral information:Topazolite information at mindat.org
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