mineral

Polished pink feldspar pebble

Orthoclase or microcline feldspar, KAlSi₃O₈; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Peach-pink, opaque to translucent, with a matte-to-waxy polished luster and massive appearance; feldspar hardness is about Mohs 6, with two cleavage directions and specific gravity near 2.55–2.63.

Identified August 11, 2026More mineral →

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Physical properties

Peach-pink, opaque to translucent, with a matte-to-waxy polished luster and massive appearance; feldspar hardness is about Mohs 6, with two cleavage directions and specific gravity near 2.55–2.63.

Formation & geological history

Potassium feldspar crystallizes mainly in granitic and pegmatitic igneous rocks as magma cools, generally during Precambrian to Phanerozoic geologic time. The rounded shape indicates later weathering, transport, and abrasion.

Uses & applications

Common feldspar is used in ceramics, glass, glazes, and aggregate; attractive pieces may be sold as inexpensive polished specimens or lapidary material.

Geological facts

The pink color commonly comes from trace iron or other impurities. A definitive distinction between orthoclase and microcline requires crystallographic or optical testing.

Field identification & locations

Look for pink or salmon color, blocky cleavage, and hardness sufficient to scratch glass but not quartz; a streak test is white. Common sources include granites and pegmatites worldwide, especially Brazil, Madagascar, India, and the United States.