Mineral

Agate

Agate (Chalcedony), SiO2

Hardness: 6.5-7, Color: Various (this specimen is tan, cream, and faint blue/gray), Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 6.5-7, Color: Various (this specimen is tan, cream, and faint blue/gray), Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline

Formed in nodules in volcanic rocks or ancient lavas, in former gas cavities, from siliceous fluids.

Frequently used in lapidary arts, wire-wrapping, and jewelry making, like the pendant shown.

Agate is a common variety of chalcedony with characteristic banding or varied colors due to trace minerals.

Identify by its waxy luster, hardness (will scratch glass), and typical patterned or banded translucent appearance.

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Schist

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Nephrite Jade

Nephrite

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]