mineral

Tumbled chalcedony or pale agate

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; cream, honey, and white coloration with subdued banding; waxy to vitreous luster; massive, cryptocrystalline structure; no visible cleavage; specific gravity about 2.6.

Identified August 14, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; cream, honey, and white coloration with subdued banding; waxy to vitreous luster; massive, cryptocrystalline structure; no visible cleavage; specific gravity about 2.6.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, often developing agate-like bands and iron staining. Most specimens are Cenozoic to Paleozoic in age, depending on the deposit.

Uses & applications

Commonly tumbled for ornamental stones, cabochons, beads, and small carvings; less commonly used as an aggregate or decorative stone.

Geological facts

The rounded shape and smooth surface indicate mechanical tumbling and polishing. The specimen could also be a pale jasper or silicified rock, but the translucent cream-white areas favor chalcedony.

Field identification & locations

Identify it by its waxy appearance, lack of cleavage, conchoidal fracture, and ability to scratch glass; a steel knife should not scratch it. Common sources include Brazil, Uruguay, Madagascar, Mexico, and the western United States.