Difference between revisions of "Andesine"

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{{Andesine}}
 
{{Andesine}}
[[Image:Andesine.JPG|left|framed|Congo andesine]]<br clear="left" />
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[[Image:Andesine1.JPG|left|framed|Congo andesine]]<br clear="left" />

Revision as of 04:35, 9 January 2007

Andesine
Chemical composition (Na,Ca)[Al(Si,Al)Si2O8]
Crystal system Triclinic
Habit Prismatic
Cleavage Distinct to perfect
Fracture Conchoidal
Hardness 6.5
Optic nature Biaxial +/-
Refractive index 1.551 - 1.560
Birefringence 0.009
Specific gravity 2.67
Lustre Sub-vitreous
Congo andesine