Quartz
Quartz var. Milky Quartz / Rock Crystal · Mineral Specimen
Crystal System
Trigonal, with a massive to crystalline habit, often occurring as druzy crusts or crystalline aggregates on a matrix.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Forms primarily through hydrothermal processes, pegmatitic crystallization, and magmatic activity at varying temperatures and pressures.
About This Crystal
The specimen features a whitish to pale yellowish, semi-translucent to opaque crystalline aggregate nested on a dark, rough matrix. The surface displays a sparkling, druzy texture with small microcrystalline points reflecting light.
Physical Characteristics
Color ranges from white to pale yellow-brown due to iron oxide staining; streak is white; cleavage is absent; fracture is conchoidal; specific gravity is approximately 2.65; tenacity is brittle; piezoelectric.
Optical Properties
Uniaxial positive optical character; refractive index ranges from 1.544 to 1.553; birefringence is 0.009; displays vitreous to greasy luster on crystal faces.
Hardness & Durability
Origin Region
Worldwide distribution, with significant deposits in Brazil, Madagascar, the United States, and the Alps.
Hardness & Durability
Mohs hardness of 7; moderate toughness; excellent chemical stability; highly durable for everyday handling but brittle under high impact.
Care & Maintenance
Can be safely cleaned with warm soapy water and a soft brush; avoid harsh acids or thermal shock; store separately to prevent scratching softer gemstones.
Rarity & Value
Very common globally; value is low to moderate depending on matrix aesthetics, crystal size, and overall specimen quality; enhancements are rare.
Special Characteristics
Displays notable microcrystalline druzy sparkle and minor iron-stain inclusions giving localized yellowish hues.
Lore & History
Historically used across various ancient cultures for talismans and tools. In modern metaphysical practices, it is regarded as a master healer stone associated with clarity, energy amplification, and all chakras.