mineral
Pink potassium feldspar (likely orthoclase)
Orthoclase, KAlSi₃O₈
AI-generated identification · may be incorrectSalmon-pink to tan, opaque, with a vitreous-to-dull luster and blocky cleavage surfaces; Mohs hardness 6. Orthoclase is monoclinic, though this rough specimen’s exact mineral identity cannot be confirmed from the photo alone.
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Physical properties
Salmon-pink to tan, opaque, with a vitreous-to-dull luster and blocky cleavage surfaces; Mohs hardness 6. Orthoclase is monoclinic, though this rough specimen’s exact mineral identity cannot be confirmed from the photo alone.
Formation & geological history
Forms during slow cooling of silica-rich magma in granite and pegmatite, and occurs in some metamorphic rocks. Such rocks range widely in age; the specimen’s age and locality are unknown.
Uses & applications
Feldspar is used in glass and ceramic manufacture; attractive crystals and specimens are collected, and feldspar may be used as a gemstone when well formed.
Geological facts
Pink feldspar is a common component of many granites and can be mistaken for similar potassium feldspars such as microcline.
Field identification & locations
Look for pink color, blocky form, and two cleavage directions meeting close to 90°; common in granites and pegmatites worldwide. A small rough specimen like this is typically worth about $1–$10 USD.
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Mineral