Physical properties of cordierite
Color: Gem-grade varieties are blue and blue-violet, and cordierite can also be colorless, yellowish white, green, brown, and gray.
Gloss and transparency: glass luster, transparent to translucent.
Photometric: biaxial crystal, negative light.
Refractive index and birefringence: RI: 1.54-1.55, DR: 0.01 ± 0.002 is related to the ratio of Mg and Fe in the composition. When Mg is rich, the refractive index is low, while when iron is rich, the refractive index is polarized.
Cordierite pleochroism: strong, trichromatic performance of yellow purple, yellow, blue. Visible to the naked eye, if you look from different directions, you can see different colors.
Luminescence: none
Absorption spectrum: expressed as iron absorption spectrum.
Cleavage: Cordierite can have three sets of cleavage, where {010} is a medium cleavage, {100} and {001} are incomplete cleavage, and the fracture is a jagged.
Hardness: Mohs hardness is 7~7.5
The relative density: 2.60, gradually increases as the content of Fe increases.
Crystal system: orthorhombic system
Crystal: short column
Aggregate type: granular, blocky
Others: (1) brittle; (2) refractive index 1.542~1.551; (3) transparent to translucent; (4) crystal couples with repeated twins and pseudo-hexagons.
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