Yellow Quartz / Citrine
Quartz var. Citrine · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal system; typically forms hexagonal prisms terminated by pyramids, but this specimen is a tumbled and polished pebble.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Forms via igneous processes in pegmatites, hydrothermal veins, and volcanic cavities under moderate temperatures and pressures.
About This Crystal
A small, tumbled, oval-shaped polished stone displaying a translucent pale yellow to golden coloration with a vitreous to waxy luster and smooth touch from tumbling.
Physical Characteristics
Yellow body color, white streak, no cleavage, conchoidal fracture, specific gravity around 2.65, brittle tenacity, and piezoelectric properties.
Optical Properties
Uniaxial positive with a refractive index of 1.544 to 1.553, birefringence of 0.009, and generally low dispersion without significant pleochroism.
Hardness & Durability
Origin Region
Found globally; major commercial sources include Brazil, Madagascar, and the United States.
Hardness & Durability
Mohs hardness of 7, good durability and toughness, suitable for daily jewelry wear with no distinct cleavage planes.
Care & Maintenance
Clean with warm soapy water using a soft brush. Avoid harsh chemical cleaners and prolonged direct sunlight to prevent fading of natural or treated color.
Rarity & Value
Common and widely available; value depends primarily on color saturation, clarity, and size, with natural deep orange-yellow stones commanding higher prices than heat-treated amethyst.
Special Characteristics
Displays piezoelectric and pyroelectric properties; natural varieties may exhibit subtle color zoning or phantom inclusions.
Lore & History
Historically regarded as a stone of abundance, manifestation, and personal power. Frequently associated with the Solar Plexus chakra in modern crystal healing traditions.