mineral

Tumbled white feldspar (likely albite or orthoclase)

Feldspar-group tectosilicate; commonly albite NaAlSi₃O₈ or orthoclase KAlSi₃O₈

AI-generated identification · may be incorrect

White to gray, pearly-to-vitreous luster, opaque, with prominent cleavage and a blocky texture; Mohs hardness 6–6.5 and specific gravity about 2.55–2.63. The ridged surfaces may reflect cleavage or natural weathering rather than deliberate polishing.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Feldspar crystallizes from cooling felsic igneous magmas, especially granite and pegmatite, and may also occur in metamorphic rocks; specimens can be hundreds of millions to billions of years old. Exact age and variety cannot be determined from the photograph alone.

Uses & applications

Used extensively in glass, ceramics, porcelain, fillers, and construction materials; attractive pieces are collected but usually have little jewelry value.

Geological facts

Feldspar is the most abundant mineral group in Earth’s crust. White feldspar can resemble quartz, but its cleavage is usually much more obvious and its hardness is slightly lower.

Field identification & locations

Look for two cleavage directions near right angles, a nonmetallic pearly luster, and inability to scratch glass reliably; quartz lacks cleavage and is harder. Common worldwide, especially in granitic terrains and pegmatites.