Riesling Beryl

A strongly dichroic variety of Beryl, originally found in eastern Germany in 1840, it is named after the Riesling grape as it has a similar pale green colour.
General Information
A variety or type of:Beryl
Chemical Formula
Al
 
2
Be
 
3
Si
 
6
O
 
18
Martin H. Read, Riesling Beryl (2009)
Physical Properties of Riesling Beryl
Mohs Hardness7.5 to 8
Walter Schumann, Gemstones of the world (2001)
Specific Gravity2.66 to 2.86
Martin H. Read, Riesling Beryl (2009)
TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityIndistinct
Walter Schumann, Gemstones of the world (2001)
FractureConchoidal
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Riesling Beryl
Refractive Index1.59
Martin H. Read, Riesling Beryl (2009)
Birefringence0.004 to 0.010
Walter Schumann, Gemstones of the world (2001)
PleochroismStrongly dichroic
Martin H. Read, Riesling Beryl (2009)
Dispersion0.014
Walter Schumann, Gemstones of the world (2001)
Colour
Colour (General)Pale green colour, with a warm golden yellow flash.
Martin H. Read, Riesling Beryl (2009)
Crystallography of Riesling Beryl
Crystal SystemHexagonal
Martin H. Read, Riesling Beryl (2009)
HabitHexagonal prisms
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Riesling Beryl information at mindat.org
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