mineral

Likely feldspar (weathered, cleaved fragment)

Probably potassium feldspar, KAlSi₃O₈ (orthoclase or microcline); identification from the photo is provisional.

AI-generated identification · may be incorrect

Cream to tan, opaque, with a blocky shape and two near-perpendicular cleavage directions; feldspar hardness is about 6 Mohs and luster is typically vitreous to pearly. The cross-hatched surface may reflect twinning, though the image alone cannot confirm it.

Identified October 14, 2026More mineral →

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At a glance

Common name: Likely feldspar (weathered, cleaved fragment)
Scientific name: Probably potassium feldspar, KAlSi₃O₈ (orthoclase or microcline); identification from the photo is provisional.
Category: mineral
Identified: October 14, 2026
Method: Standard

AI Estimated Value

A small, common feldspar fragment is typically worth about $1–$10; distinctive or well-formed specimens may sell for more.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Feldspar crystallizes in igneous and metamorphic rocks; potassium feldspar commonly forms in granites and pegmatites over a wide range of geological ages.

Uses & applications

Feldspar is used chiefly in glass and ceramic manufacture; attractive, clear varieties are occasionally cut as gemstones.

Geological facts

Cross-hatched twinning can help distinguish microcline from other feldspars, but weathering and the viewing angle can obscure the pattern.

Field identification & locations

Look for hardness near 6, blocky cleavage, and a light-colored streak; common in granites and pegmatites worldwide. A fresh surface and simple hardness or cleavage tests would improve identification.