Yellow Quartz (Citrine Quartz or Yellow Chalcedony)

Physical Properties

Hardness: 7 on the Mohs scale. Color: Pale yellow to honey-orange. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal) system. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Formation & Geological History

Formed through the crystallization of silica-rich hydrothermal solutions in veins or geodes. Often found in igneous environments like pegmatites or in sedimentary riverbeds as water-worn pebbles. Younger, lab-treated versions are often heat-treated amethyst.

Uses & Applications

Commonly used in jewelry as a semi-precious gemstone, in decorative carvings, and as a popular 'healing' crystal in the metaphysical community. In industry, quartz is used for its piezoelectric properties and in glass making.

Geological Facts

Natural citrine is quite rare; most 'citrine' found on the market is actually purple amethyst or smoky quartz that has been heat-treated to turn it yellow. It is known as the 'Success Stone' in various spiritual traditions.

Field Identification & Locations

Identify by its hardness (it should scratch glass but not be scratched by a steel knife) and its lack of cleavage. Look for the translucent yellow color and rounded, water-worn shape if found near riverbeds. Common in Brazil, Madagascar, and the USA (Colorado/North Carolina).

Identified on: 4/25/2026

Mode: Standard