mineral

Yellow Quartz (Citrine/Quartzite Pebble)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Pale yellow to off-white; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Pale yellow to off-white
Luster: Vitreous to waxy

Identified March 25, 2026More mineral →

Explore Yellow Quartz (Citrine/Quartzite Pebble) in the encyclopedia →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pale yellow to off-white; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes or via the metamorphosis of quartz-rich sandstone. This specific specimen appears to be a water-worn or tumbled river pebble, which could range from millions to hundreds of millions of years in age depending on the parent rock.

Uses & applications

Used primarily for decorative purposes, lapidary work (tumbling/polishing), and sometimes in metaphysical practices. In industrial forms, quartz is used for abrasive and glassmaking.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this one often get their yellow tint from trace amounts of iron or heat-induced changes in the crystal lattice.

Field identification & locations

Identify in the field by its hardness (it should scratch glass), lack of cleavage, and translucent appearance. Frequently found in riverbeds, gravel pits, and coastal areas globally.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

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metamorphic

Gypsum (variety Selenite or Alabaster)

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Mineral

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Nephrite

Mineral/Rock

Granite

Granite (Phaneritic intrusive igneous rock)

igneous