Xonotlite

Big Photo

Italy
2.73 carats
© Rarestone.com

Xonotlite is named after its discovery locality, at Tetala de Xonotla. Mexico.

Xonotlite forms translucent needle-like chalky white to bluish grey crystals or fibrous masses.

Crystals of gem-quality are very rare.

Xonotlite 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
Chemical Formula
Ca
 
6
Si
 
6
O
 
17
(OH)
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Xonotlite
Mohs Hardness6 to 6.5
Michael O’Donoghue, Gems, Sixth Edition (2006)
Specific Gravity2.71 to 2.72
Michael O’Donoghue, Gems, Sixth Edition (2006)
Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
FractureSplintery
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Xonotlite
Refractive Index1.581 to 1.593
Michael O’Donoghue, Gems, Sixth Edition (2006) RI for the alpha, beta and gamma rays is 1.581–1.583, 1.581–1.583 and 1.591–1.593
Optical CharacterBiaxial/+
Michael O’Donoghue, Gems, Sixth Edition (2006)
Birefringence0.010
Michael O’Donoghue, Gems, Sixth Edition (2006)
Colour
Colour (General)Chalky white to bluish grey
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
TransparencyTranslucent
Michael O’Donoghue, Gems, Sixth Edition (2006)
LustrePearly,Greasy
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Xonotlite
Crystal SystemMonoclinic,Triclinic
Michael O’Donoghue, Gems, Sixth Edition (2006)
HabitNeedle-like crystals or fibrous masses
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Geological Environment
Where found:Xonotlite occurs in contact metamorphic deposits within limestones and serpentines.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Xonotlite information at mindat.org
Significant Gem Localities
Mexico
 
  • Puebla
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 468
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