Rossmanite

Rossmanite is named after George R. Rossman, California Institute of Technology, Pasadena, California, USA, in recognition for his work on the spectroscopy of the tourmaline minerals.

Rossmanite is a member of tourmaline group. It forms transparent, pink, pale pink to colourless prismatic crystals.

Rossmanite has been faceted into small attractive gems.
General Information
Chemical Formula
◻(LiAl
 
2
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Rossmanite
Mohs Hardness7 to 0
Gemdat.org, Management Team (2012)
Specific Gravity3
Webmineral.com, Mineralogy Database (2012)
TenacityBrittle
Webmineral.com, Mineralogy Database (2012)
Cleavage QualityNone
Webmineral.com, Mineralogy Database (2012)
Optical Properties of Rossmanite
Refractive Index1.624 to 1.645
Gemdat.org, Management Team (2012)
Optical CharacterUniaxial/-
Gemdat.org, Management Team (2012)
Birefringence0.021
Gemdat.org, Management Team (2012)
Colour
Colour (General)Pale-pink to colorless
Gemdat.org, Management Team (2012)
TransparencyTransparent
Webmineral.com, Mineralogy Database (2012)
LustreVitreous
Gemdat.org, Management Team (2012)
Crystallography of Rossmanite
Crystal SystemTrigonal
Gemdat.org, Management Team (2012)
Further Information
Mineral information:Rossmanite information at mindat.org
Significant Gem Localities
Italy
 
  • Tuscany
    • Livorno Province
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