Mineral

Agate

SiO2

Hardness: 6.5-7, Color: Gray, white, yellow, brownish, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline

Identified June 18, 2026More mineral →

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Physical properties

Hardness: 6.5-7, Color: Gray, white, yellow, brownish, Luster: Waxy to vitreous, Crystal structure: Cryptocrystalline

Formed in nodules in volcanic rocks or ancient lavas, often filling cavities produced by the release of volatiles in the molten rock.

Used in jewelry, typically cut into cabochons or beads. Also collected by rock enthusiasts.

Agate is a banded form of finely-grained, microcrystalline Quartz.

Identify by its waxy luster, hardness (can scratch glass), and characteristic banded or mottled patterns. Commonly found worldwide in volcanic areas.

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Calcite–fluorite mineral specimen with iron-oxide staining

Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Septarian Pebble

Septarian nodule / Concretion

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)