mineral

Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)

Silica (SiO2) and Calcium Fluoride (CaF2) based minerals

Hardness varies from 4 (Fluorite) to 7 (Agates). Colors include purple, green, blue, and grey. Luster is vitreous to waxy. Crystals are primarily hexagonal or isometric in structure.

Identified May 30, 2026More mineral →

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Physical properties

Hardness varies from 4 (Fluorite) to 7 (Agates). Colors include purple, green, blue, and grey. Luster is vitreous to waxy. Crystals are primarily hexagonal or isometric in structure.

Formation & geological history

Formed through hydrothermal processes, sedimentary deposition of silica-rich fluids, and volcanic activity in cavities (vugs). Most are found in ancient volcanic flows or limestone deposits.

Uses & applications

Used primarily for lapidary arts, jewelry making, meditation, and decorative fossil/mineral collections.

Geological facts

Fluorite was the original historical source of the word 'fluorescence' due to its glow under UV light. Agates have been used as amulets for over 3,000 years in Ancient Greece.

Field identification & locations

Identify by color banding (agates), translucency, and hardness tests. Common in Brazil, India, and the United States. Tumbled stones are polished in rotating barrels with abrasive grit.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

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

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic

Green Apatite on Albite

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

mineral