Chrome-Chalcedony

Big Photo

Zimbabwe
3.73 carats
© raregemhunter

Chrome-Chalcedony (also called mtorolite or mtorodite) is a trade name for a Chalcedony from Zimbabwe, which has a natural green colour from chromium.

Chrome-Chalcedony Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
A variety or type of:Chalcedony, which is a variety of Quartz
Other Names/Trade Names:
Chemical Formula
SiO
 
2
(with trace Cr minerals)
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Chrome-Chalcedony
Mohs Hardness6.5 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity2.55 to 2.70
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical Properties of Chrome-Chalcedony
Refractive Index1.530 to 1.543
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.003 to 0.009
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
Colour (General)Green
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Causes of ColourColored by chromium
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
TransparencyTranslucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
LustreWaxy,Resinous
Arthur Thomas, Gemstones (2009)
Crystallography of Chrome-Chalcedony
Crystal SystemTrigonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
HabitFibrous to grained aggregate
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Inclusions in Chrome-Chalcedony
May contain tiny black chromite inclusions - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7
Further Information
Mineral information:Chrome-Chalcedony information at mindat.org
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.