Stibnite (Reflected Light)
Stibnite (Sb2S3) optical properties using a reflected-light polarizing microscope (adapted from Spry & Gedlinske, 1987):
System: Orthorhombic
Reflectance: Strong
Colour: White to greyish white
VHN and polishing hardness: 42 - 153 / soft
Pleochroism: Strong, dull grey-white, brownish grey, white
Anisotropism: Strong, but often undulose extinction- blue, grey, brown, pinkish brown
Internal reflections: Not present
Twinning: Pressure twins, deformation twins common
Commonly associated minerals: Ag minerals, antimony, berthierite, chalcopyrite, cinnabar, gold, orpiment, pyrite, pyrrhotite, realgar, sphalerite
Sample from the EOSC424 reflected light sample collection at UBC
Видео Stibnite (Reflected Light) канала Nichole Moerhuis
System: Orthorhombic
Reflectance: Strong
Colour: White to greyish white
VHN and polishing hardness: 42 - 153 / soft
Pleochroism: Strong, dull grey-white, brownish grey, white
Anisotropism: Strong, but often undulose extinction- blue, grey, brown, pinkish brown
Internal reflections: Not present
Twinning: Pressure twins, deformation twins common
Commonly associated minerals: Ag minerals, antimony, berthierite, chalcopyrite, cinnabar, gold, orpiment, pyrite, pyrrhotite, realgar, sphalerite
Sample from the EOSC424 reflected light sample collection at UBC
Видео Stibnite (Reflected Light) канала Nichole Moerhuis
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