metamorphic

Quartz-rich metamorphic pebble, possibly jade-like greenstone

Likely quartzite or altered basalt/greenstone; visible minerals may include quartz, feldspar, chlorite/epidote, and iron oxides

AI-generated identification · may be incorrect

Gray-white to yellow-green, dull to weakly glassy luster, fine-grained and water-worn, with no obvious cleavage or crystal faces. Estimated hardness is about 6–7 Mohs if quartz-rich; exact specific gravity cannot be determined visually.

Identified August 9, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic pebble, possibly jade-like greenstone
Scientific name: Likely quartzite or altered basalt/greenstone; visible minerals may include quartz, feldspar, chlorite/epidote, and iron oxides
Category: metamorphic
Identified: August 9, 2026
Method: Standard

AI Estimated Value

$1–$10 as a common water-worn pebble; approximately $10–$50 if attractive and polishable, with substantially higher value only after confirmed jade or another gem material.

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

Probably a glacial or stream-rounded cobble from the Pacific Northwest, where metamorphosed volcanic rocks, quartzite, and altered greenstones are common. Yellow coloration may reflect iron-oxide weathering; age is likely Mesozoic or older depending on source terrane.

Uses & applications

Usually collected as a scenic or lapidary stone; suitable pieces may be polished or cut for cabochons. Not typically valuable for construction unless present in large aggregate deposits.

Geological facts

The image does not show diagnostic texture for a precise mineral identification. Its mottled pale green-gray appearance can resemble low-grade jade, but true nephrite requires fibrous interlocking amphibole and should not be claimed from appearance alone.

Field identification & locations

Near 48.4°N, 122.3°W, glacially transported greenstone, altered basalt, and quartz-rich metamorphic pebbles are plausible. Field tests: glass-scratch test, streak, density, and a close look for fibrous versus granular texture; avoid acid testing unless carbonate veining is suspected.