mineral

Tumbled pink feldspar (likely moonstone or orthoclase)

Potassium feldspar, chiefly orthoclase (KAlSi₃O₈); possibly adularescent moonstone

AI-generated identification · may be incorrect

Pale pink, cream, and gray rounded pebble with a waxy to vitreous luster and visible cloudy translucence. Feldspar hardness is about 6–6.5 Mohs, with two good cleavage directions; the image does not clearly show diagnostic blue adularescence.

Identified August 29, 2026More mineral →

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At a glance

Common name: Tumbled pink feldspar (likely moonstone or orthoclase)
Scientific name: Potassium feldspar, chiefly orthoclase (KAlSi₃O₈); possibly adularescent moonstone
Category: mineral
Identified: August 29, 2026
Method: Standard

AI Estimated Value

$2–$15 for a common tumbled feldspar; approximately $10–$100+ if it displays strong, attractive moonstone adularescence.

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

Formed by crystallization in silica-rich igneous rocks such as granite or pegmatite; feldspars are mainly Precambrian to Phanerozoic in age. Tumbled surfaces are human-processed from naturally occurring material.

Uses & applications

Used as an ornamental and lapidary stone, in carvings and cabochons, and industrially in glass and ceramics. Ordinary tumbled pieces have modest collector value.

Geological facts

Moonstone is an intergrowth of feldspar varieties that scatters light to produce a floating sheen; pink coloration commonly reflects trace iron or other impurities. Similar appearance can also come from pink microcline or orthoclase.

Field identification & locations

Identify by pink/cream color, moderate translucence, glassy-waxy luster, and cleavage; a blue-white floating flash supports moonstone identification. Common sources include India, Madagascar, Sri Lanka, Brazil, and the United States.