mineral

Polished pink feldspar pebble

Orthoclase or microcline feldspar, KAlSi₃O₈

AI-generated identification · may be incorrect

Pale pink, rounded and polished, with a vitreous to pearly luster; hardness about 6 Mohs, white streak, imperfect cleavage, and monoclinic (orthoclase) or triclinic (microcline) crystals. The image does not show diagnostic crystal faces or cleavage clearly.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Potassium feldspar crystallizes from silica-rich igneous rocks such as granite and pegmatite, commonly during the Precambrian through Cenozoic; this piece appears naturally rounded or tumbled. Pink color usually results from trace iron and structural defects.

Uses & applications

Used extensively in glass and ceramic manufacture; attractive polished pieces are sold as inexpensive decorative stones or lapidary material, but this small specimen is generally not gem grade.

Geological facts

Feldspar is the most abundant mineral group in Earth’s crust. A scratch test against steel or glass can help distinguish it from softer pink minerals, though testing may mark a polished specimen.

Field identification & locations

Common in granitic terrains worldwide, especially India, Madagascar, Brazil, Russia, and the United States. Confirm with hardness, cleavage, and—if available—testing for potassium feldspar rather than quartz or pink calcite.