Quartz
Silicon Dioxide var. Milky/Common Quartz · Mineral Specimen
Crystal System
Trigonal, massive to granular habit with irregular form
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal, igneous, metamorphic, and sedimentary processes across wide temperature and pressure ranges
About This Crystal
A small, weathered, whitish to yellowish pebble of quartz resting in a human hand, showing translucent to opaque areas with minor surface iron-staining.
Physical Characteristics
Color ranges from white to yellow-brown, white streak, no true cleavage, conchoidal fracture, specific gravity around 2.65, brittle tenacity, non-magnetic
Optical Properties
Refractive index of 1.544 to 1.553, uniaxial positive, doubly refractive, vitreous to greasy luster
Hardness & Durability
Origin Region
Found globally; common in regional geological formations worldwide
Hardness & Durability
Mohs hardness of 7, good durability, resistant to scratching by most common materials, lacks cleavage making it structurally durable
Care & Maintenance
Clean with warm soapy water, safe for ultrasonic and steam cleaning, store away from harder stones to avoid scratching softer materials
Rarity & Value
Extremely common mineral worldwide; low monetary value for small raw specimens
Special Characteristics
Piezoelectric and pyroelectric properties; common presence of microscopic fluid inclusions
Lore & History
Historically used in ancient tools and ornaments; traditionally associated in modern crystal healing with clarity, energy amplification, and balancing the crown chakra