mineral

Tumbled amber-colored quartz or chalcedony

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; honey-brown to orange, translucent, with a waxy to vitreous luster and no visible cleavage. The rounded shape indicates tumbling or natural abrasion; exact identification requires testing.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz-rich silica formed in cavities, veins, or volcanic sedimentary environments, commonly through silica-rich groundwater deposition. Its geological age may range from relatively young surficial deposits to ancient host-rock formation.

Uses & applications

Used as a decorative tumbled stone, lapidary material, and inexpensive cabochon or jewelry component; not typically used structurally.

Geological facts

Iron oxides commonly produce the orange-brown coloration. If unusually lightweight, soft, or warm-feeling, it could instead be amber, which has hardness only about 2–2.5.

Field identification & locations

Common sources include Brazil, Madagascar, Uruguay, India, and the United States. Check streak, hardness, weight, and reaction to a steel blade; quartz resists scratching, while amber scratches easily and may float in concentrated salt water.