mineral

Likely tumbled quartz/chalcedony pebble

Quartz (SiO₂), possibly microcrystalline chalcedony

AI-generated identification · may be incorrect

Small rounded, opaque-to-translucent cream specimen with a matte/satin surface and no visible cleavage. Quartz hardness is Mohs 7, vitreous when fresh, and specific gravity is about 2.65; the image is insufficient to confirm crystal structure or exact variety.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely naturally rounded quartz or chalcedony, possibly subsequently tumbled or worn; quartz commonly forms in igneous, hydrothermal, and sedimentary settings from Precambrian to recent ages.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and countertop materials; attractive pieces are sold as lapidary or curiosity specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals. Chalcedony is fibrous microcrystalline quartz and often appears waxy rather than showing visible crystal faces.

Field identification & locations

Check for hardness by testing glass (carefully), conchoidal fracture, and lack of cleavage; a steel nail should not scratch it. Common worldwide, especially in quartz veins, gravels, and cavities; a definitive ID may require a close-up, streak, and hardness tests.