mineral
Tumbled feldspar, likely orthoclase
Potassium feldspar (KAlSi₃O₈), likely orthoclase
AI-generated identification · may be incorrectCreamy yellow to ivory, opaque, with a dull to pearly luster and rounded, polished surfaces. Feldspar has Mohs hardness 6, a monoclinic crystal structure, and two good cleavage directions; the image alone cannot confirm the specific feldspar.
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Physical properties
Creamy yellow to ivory, opaque, with a dull to pearly luster and rounded, polished surfaces. Feldspar has Mohs hardness 6, a monoclinic crystal structure, and two good cleavage directions; the image alone cannot confirm the specific feldspar.
Formation & geological history
Feldspar crystallizes from magma in igneous rocks and also occurs in metamorphic rocks; potassium feldspar formed in many settings across geologic time. This specimen appears mechanically tumbled and polished.
Uses & applications
Commonly used in ceramics and glassmaking; attractive feldspar pieces are collected or made into beads and decorative items.
Geological facts
Feldspar is the most abundant mineral group in Earth’s crust and is a principal constituent of granite.
Field identification & locations
Its pale color and cleavage-like surface marks fit feldspar, but visual identification is uncertain without testing. Found worldwide, especially in granites and pegmatites.
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Mineral