mineral

Chalcedony (Botryoidal/Chalcedony Rose)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale), Color: White to light blue/gray, Luster: Waxy to vitreous, Crystal Structure: Cryptocrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58-2.64

Hardness: 6

Identified May 27, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: White to light blue/gray, Luster: Waxy to vitreous, Crystal Structure: Cryptocrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58-2.64

Formation & geological history

Formed from the deposition of silica-rich fluids in cavities or fractures within volcanic or sedimentary rocks over millions of years at relatively low temperatures.

Uses & applications

Used in gemstone carving, jewelry (cabochons), and highly valued by mineral collectors for its unique 'rose' or botryoidal formations.

Geological facts

A 'chalcedony rose' is a unique shape formed when chalcedony grows in a radiating pattern inside a pocket. It is part of the quartz family but has crystals so small they can only be seen under high magnification.

Field identification & locations

Identify by its waxy luster, hardness (it will scratch glass), and the concentric, bubbly, or rose-like growth patterns. Commonly found in desert regions of the southwestern USA, Mexico, and Brazil.

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