mineral

Tumbled Clear Quartz and Citrine Points

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Colorless to yellow/orange, Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified June 26, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Colorless to yellow/orange, Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal crystallization in igneous veins or as deposits from silica-rich groundwater. These specimens are often found in pegmatites and geodic cavities.

Uses & applications

Used widely in lapidary work for jewelry, meditation, and healing practice collections. Industrially used in optics and electronics (though usually synthetic for these purposes).

Geological facts

Quartz is the second most abundant mineral in Earth's crust. Citrine is the rare yellow/orange variety of quartz, though most commercial citrine is actually heat-treated amethyst.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and the presence of six-sided crystal habits. Found globally with major deposits in Brazil and Madagascar.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

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

Green Apatite on Albite

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

mineral