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Zoisite: Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Comments: Gem quality crystal of zoisite with the striking pleochroism displayed in three different views.
Location: Alchuri Village, Shigar Valley, north of Skardu, Baltistan, Pakistan.
Scale: 1x1x3.8 cm.
© Dan Weinrich
Comments: Dual views of a large crystal of blue-violet zoisite (var. tanzanite) showing the pleochroism.
Location: Merelani Hills, Umba Valley, Lelatema Mts., Arusha Region, Tanzania.
Scale: 35 mm 42.32 ct.
© John Betts - Fine Minerals