Cordierite thin section
For Pierre Louis A. Cordier (1777-1861), French mining engineer and geologist.
Formula: Mg2Al3(AlSi5)O18
System: Orthorhombic
Color: Grey, blue, blue-violet, etc.
Lustre: Vitreous
Hardness: 7–7½
Density: 2.6–2.66
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Relief: Low...