Crystal system: Isotropic
Refractive index:
Birefringence:
Cleavage:
Twinning:
Colour in PPL: colourless
Pleochroism: none
Relief:
Distinction:
Occurrence: clear and unaltered glass, vesicular, and/or Y - shaped fracture patterning observed
|
Volcanic ash - Plain polarized light - Volcanic 1 petrofabric - Belize
|
