mineral

Agate

SiO2

Mohs hardness 6.5-7, variety of colors and patterns, waxy luster, microcrystalline quartz

Identified June 17, 2026More mineral →

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Physical properties

Mohs hardness 6.5-7, variety of colors and patterns, waxy luster, microcrystalline quartz

Forms in volcanic rocks or ancient lavas, filling cavities or veins

Jewelry, lapidary arts, ornamental carving

Named after the Achates River in Sicily where it was first discovered

Identify by its translucent nature, banding, and hardness. Often found in areas with past volcanic activity.

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)]