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Cordierite



Chemical formula: 2MgO x 2Al2O3 x 5SiO2
Modifications: Three modifications of cordierite are known, alpha, beta and mi. Alpha-cordierite is the stable high temperature from above 830^oC. It can be easily be super-cooled. Beta-cordierite is the stable low-temperature polymorph and Mi-cordierite is a metastable low-temperature polumorph.
Melting point: 1460^oC
Density: 2.55 g/cm3
Microhardnes: No data
Hardness (Moh's): 7
Luminescence: Non-fluorescent
Crystal system: Orthorhombic
Cell dimensions: a=17.13 A, b=9.8 A, c=9.3 A
PDF number: 00-002-0646
ICSD number: 100250
Note: No data