mineral

Agate (Turtle Carving)

Agate (Cryptocrystalline variety of Silica, SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Smoky grey, translucent cream, and tan; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.64.

Hardness: 6
Color: Smoky grey, translucent cream, and tan
Luster: Waxy to vitreous

Identified June 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed as secondary deposits in volcanic cavities (vesicles) or sedimentary nodules through the deposition of silica from groundwater. Most commercial deposits are millions of years old, often found in Cenozoic volcanic rocks.

Uses & applications

Used primarily in lapidary arts for ornamental carvings, jewelry (cabochons), and decorative home decor.

Geological facts

Agate is a variety of chalcedony characterized by its fineness of grain and brightness of color. This specimen is a 'flower agate' or smoky variant carved into a zoomorphic shape, a common practice in the holistic and mineral collecting communities.

Field identification & locations

Identify by its translucency, waxy luster, and lack of visible crystalline structure to the naked eye. Found worldwide, with major deposits in Brazil and Madagascar. For collectors, look for smoothness and consistent color depth.

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Mineral/Rock

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mineral