Quartz
Quartz (Silicon Dioxide) · Mineral Specimen
Crystal System
Trigonal, massive or anhedral habit in this weathered form
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Igneous, metamorphic, and sedimentary processes; this specimen shows signs of mechanical weathering and aqueous transport (water-worn pebble)
About This Crystal
An opaque to translucent, weathered, rounded pebble of quartz resting among debris. The surface is dull, chalky white-to-grey with minor organic patches and slight greenish lichen or moss growth.
Physical Characteristics
Color is light grey/white; streak is white; cleavage is none; fracture is conchoidal; specific gravity is approximately 2.65; tenacity is brittle
Optical Properties
Uniaxial positive, singly or doubly refractive depending on light orientation, vitreous luster on fresh breaks but dull/waxy on the weathered exterior surface
Hardness & Durability
Origin Region
Found worldwide; common in alluvial gravels, riverbeds, and weathered terrestrial environments
Hardness & Durability
Mohs hardness of 7; high durability and resistance to chemical weathering, making it persist long after host rocks erode
Care & Maintenance
Wash with warm soapy water and a soft brush; resistant to most household chemicals and sunlight exposure
Rarity & Value
Extremely common; negligible commercial value as a raw pebble, though useful for lapidary work or general mineral collections
Special Characteristics
Displays typical conchoidal weathering patterns and high resistance to abrasion, holding a smooth rounded shape from fluvial transport
Lore & History
Quartz has been used by ancient humans for millennia to create stone tools, arrowheads, and ritual objects due to its conchoidal fracture and hardness. In modern metaphysical practices, clear and milky quartz varieties are considered master healers and amplifiers of energy, though this is traditional lore rather than scientific fact.