Clear Quartz
Quartz (Silicon Dioxide) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal crystal system; the natural habit consists of six-sided prisms terminating with six-sided pyramids. This specimen is carved and polished into a mushroom shape.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Primarily hydrothermal; it crystallizes from silica-rich fluids in rock cavities at high temperatures and pressures.
About This Crystal
This specimen is a translucent to semi-opaque milky white polished carving. It exhibits a vitreous luster on the surface with internal cloudy inclusions and a grainy texture visible within the core.
Physical Characteristics
Color: Colorless/White; Streak: White; Luster: Vitreous; Diaphaneity: Translucent; Fracture: Conchoidal (observable if chipped); Density: 2.65 g/cm³; Non-magnetic.
Optical Properties
Refractive Index: 1.544 - 1.553; Birefringence: 0.009 (uniaxial positive). It is doubly refractive, though difficult to measure in a carved piece.
Hardness & Durability
Origin Region
Brazil, Madagascar, and the United States (Arkansas) are major sources; it forms in diverse geological environments including pegmatites and hydrothermal veins.
Hardness & Durability
Mohs hardness: 7; Highly durable for everyday wear and handling, resistant to scratches from most common household objects.
Care & Maintenance
Safe to clean with warm soapy water and a soft brush. Avoid hydrofluoric acid. Generally stable in sunlight, which distinguishes it from varieties like Amethyst that might fade.
Rarity & Value
Common; value is determined by clarity and the quality of the carving. Inexpensive and widely available globally.
Special Characteristics
Exhibits piezoelectricity; this specific piece shows internal milky cloudiness (sometimes called 'Snow Quartz' or 'Milky Quartz' when fully opaque).
Lore & History
Historically known as 'rock crystal,' derived from the Greek 'krystallos' meaning ice. Traditionally believed in various cultures to be a 'master healer' and used for clarity and amplification of energy.