mineral

Banded agate geode fragment

Microcrystalline quartz (chalcedony), SiO₂

AI-generated identification · may be incorrect

Translucent pale blue-white concentric bands surround a small druzy quartz cavity; hardness 6.5–7 Mohs, waxy to vitreous luster, trigonal quartz structure, no cleavage, specific gravity about 2.6.

Identified October 2, 2026More mineral →

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Physical properties

Translucent pale blue-white concentric bands surround a small druzy quartz cavity; hardness 6.5–7 Mohs, waxy to vitreous luster, trigonal quartz structure, no cleavage, specific gravity about 2.6.

Formation & geological history

Silica-rich groundwater deposited successive chalcedony layers in a cavity, with quartz crystals later growing inside. Agates form in many volcanic and sedimentary settings over geological time; the specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Agate is used for jewelry, ornaments, carvings, and decorative slabs; druzy cavities are popular in mineral collections.

Geological facts

Agate banding records changes in silica deposition, while the sparkling interior is a druzy coating of tiny quartz crystals.

Field identification & locations

Look for curved or concentric bands and a glassy, sparkling cavity; common sources include Brazil, Uruguay, Mexico, and the United States. The visible pale blue color may be natural or enhanced, which cannot be confirmed visually.