Sillimanite market statistics

Sillimanite

  • Color: light yellowish green, light blue, greyish, brown, colorless
  • Hardness: 6.5 - 7.5
  • Refractive index: 1.65 - 1.68
  • Density: 3.25
  • Chemical composition: Al2OSiO5
  • Crystal structure: orthorhombic
  • Origins: USA, Madagascar, India, Sri Lanka, Burma, Australia, Czechoslovakia, Italy, Germany, Brazil.

Collectors stone rarely used in jewelry, also known as fibrolite. Stones are generally not treated.


The figures are based on Gemval's aggregated valuation statistics for the retail market. Irrelevant, controversial or repeat data are excluded from our analysis wherever possible. The figures are updated monthly.

Weight distribution for Sillimanite

Occurrence is represented in % for different weight categories.

Price distribution for Sillimanite

Occurrence is represented in % for different value intervals.

Clarity distribution for Sillimanite

Occurrence is represented in % for different clarity grades.


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