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Oligoclase: (Na,Ca)(Si,Al)4O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Rectangular cleavage fragment of salmon-orange oligoclase (sunstone) feldspar.
Scale: 47x30x7 mm.
© John Betts - Fine Minerals
Comments: Clear glassy crystalline oligoclase with milky quartz and muscovite.
Location: Bakersville, Mitchell County, North Carolina, USA.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species