tourmaline

  • tourmaline
  • tourmaline
  • tourmaline
  • tourmaline
  • tourmaline
tourmalinetourmalinetourmalinetourmalinetourmaline

tourmaline

  • Product description: tourmaline
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Tourmaline
Chemical composition: [Na, K, Ca][Mg, F, Mn, Li, Al]3[Al, Cr, Fe, V]6[BO3]3[Si6O18][OH, F]
Three party system
The crystal habit: column, three columns, six square columns, three single cones, a collection of radial, rod bundle.
Cleavage and fracture: cleavage, uneven or conchoidal fracture.
Optical properties: heterogeneous body.
Luster: glass luster.
Transparency: transparent to opaque.
Polychroism: two colors of all.
Hardness: 7-8.
The proportion of:3.03.2 refractive index 1.62-1.64.
Birefringence: 0.018~0.040, usually 0.020.


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