mineral

Likely feldspar (weathered potassium feldspar)

K-feldspar, commonly orthoclase or microcline; KAlSi₃O₈

AI-generated identification · may be incorrect

Pale cream to peach, opaque, with a dull-to-pearly luster and blocky cleavage surfaces; Mohs hardness about 6. The photo lacks scale and diagnostic tests, so the identification is provisional.

Identified October 4, 2026More mineral →

Explore Likely feldspar (weathered potassium feldspar) in the encyclopedia →

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Physical properties

Pale cream to peach, opaque, with a dull-to-pearly luster and blocky cleavage surfaces; Mohs hardness about 6. The photo lacks scale and diagnostic tests, so the identification is provisional.

Formation & geological history

Feldspar crystallizes from cooling magma in igneous rocks and also occurs in metamorphic rocks; it formed throughout geologic time. Weathering can make exposed surfaces look tan and rough.

Uses & applications

Feldspar is used in glass and ceramics, and attractive crystals or specimens are collected. This small, rough piece appears to have little commercial value.

Geological facts

Feldspar is the most abundant mineral group in Earth’s crust. Potassium feldspar is distinguished from plagioclase by laboratory or field tests rather than color alone.

Field identification & locations

Look for two cleavage directions meeting near 90° and hardness near 6; compare against quartz, which lacks cleavage and is harder. Common worldwide in granite and related rocks.