mineral

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 Mohs; Color: sky-blue to semi-opaque light blue; Luster: waxy to vitreous; Structure: Microcrystalline; Specific Gravity: 2.6

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: sky-blue to semi-opaque light blue; Luster: waxy to vitreous; Structure: Microcrystalline; Specific Gravity: 2.6

Formed in volcanic and sedimentary environments through the deposition of silica-rich fluids in rock cavities at low temperatures.

Primarily used in jewelry for beads, cabochons, and ornamental carvings. Also valued for metaphysical collection.

Named after the ancient town of Chalcedon in Asia Minor. It is known for its subtle inner glow and was once widely used for seals and signet rings.

Identify by its waxy luster, lack of cleavage, and uniform sky-blue color. Found commonly in Turkey, Namibia, Brazil, and the USA.

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)

Biotite Schist

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