Quartz
Quartz var. Milky Quartz · Mineral Specimen / Semi-Precious
Crystal System
Trigonal, typically forming prismatic crystals terminated by rhombohedrons, though this specimen appears as a small, worn, anhedral pebble or fragment.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Igneous, metamorphic, and sedimentary processes; commonly crystallizes from silica-rich hydrothermal solutions at varying temperatures and pressures.
About This Crystal
A small, translucent to milky-white, irregular pebble-sized mineral fragment with a vitreous to greasy luster, showing smooth, water-worn edges.
Physical Characteristics
Color is milky white to off-white; streak is white; cleavage is absent (conchoidal fracture); specific gravity is approximately 2.65; brittle tenacity; displays no significant magnetism.
Optical Properties
Uniaxial positive optical sign with a refractive index of 1.544 to 1.553 and low birefringence (0.009); doubly refractive.
Hardness & Durability
Origin Region
Found globally; major sources include Brazil, the United States, Madagascar, and the Alps. Forms in diverse geological environments.
Hardness & Durability
Mohs hardness of 7; good durability and wearability for jewelry, though lacking cleavage makes it resistant to splitting but prone to conchoidal chipping.
Care & Maintenance
Can be cleaned safely with warm soapy water and a soft brush; avoid harsh chemicals or sudden extreme temperature changes, though generally very stable.
Rarity & Value
Extremely common; low commercial value for small, tumbled fragments, though valued in educational and bulk crafting contexts.
Special Characteristics
Exhibits piezoelectric and pyroelectric properties under mechanical stress or temperature change.
Lore & History
Historically used across many cultures for amulets and tools; in modern crystal healing, quartz is considered a master healer stone associated with clarity and purification (traditional beliefs only).