Quartz Pebble
Quartz (Silicon Dioxide) · Mineral Specimen
Crystal System
Trigonal, massive to granular habit with rounded water-worn form
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Sedimentary transport and weathering of primary igneous and metamorphic rocks
About This Crystal
A small, weathered, greyish-white pebble showing signs of alluvial transport with rounded edges and a matte to sub-vitreous luster
Physical Characteristics
Color ranges from grey to white, white streak, conchoidal fracture, no distinct cleavage, specific gravity of 2.65, brittle tenacity
Optical Properties
Uniaxial positive optical character, refractive index of 1.544-1.553, low birefringence
Hardness & Durability
Origin Region
Worldwide distribution, commonly found in riverbeds, beaches, and glacial till
Hardness & Durability
Mohs hardness of 7, excellent durability with no cleavage, highly resistant to weathering and chemical attack
Care & Maintenance
Safe for standard cleaning with warm soapy water; resistant to household chemicals and scratching due to high hardness
Rarity & Value
Extremely common worldwide, nominal commercial value primarily used for landscaping or as a tumbling rough
Special Characteristics
May exhibit weak piezoelectric properties and occasional subtle luminescence under UV light
Lore & History
Used historically by ancient cultures for stone tools and amulets; in modern crystal lore, quartz is considered a master healer and amplifier of energy