Quartz Pebble
Quartz var. Common Quartz · Mineral Specimen
Crystal System
Trigonal, massive or tumbled habit
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Sedimentary transport and mechanical weathering (water-worn pebble)
About This Crystal
A small, water-worn, rounded pebble with an opaque to translucent appearance, dull to waxy luster, and a grayish-brown weathered exterior surface typical of alluvial quartz.
Physical Characteristics
Color is grayish-brown, streak is white, cleavage is absent, fracture is conchoidal, specific gravity is approximately 2.65, tenacity is brittle.
Optical Properties
Uniaxial positive, refractive index of 1.544 to 1.553, birefringence of 0.009, doubly refractive.
Hardness & Durability
Origin Region
Found worldwide in alluvial deposits, riverbeds, and beaches
Hardness & Durability
Mohs hardness of 7, excellent durability with no cleavage making it highly resistant to wear.
Care & Maintenance
Can be easily cleaned with warm soapy water and a soft brush; highly chemically stable.
Rarity & Value
Extremely common worldwide, low monetary value, typically collected as a natural specimen or beach keepsake.
Special Characteristics
Piezoelectric and pyroelectric properties common to crystalline quartz.
Lore & History
Used by various ancient cultures for simple stone tools, and in modern metaphysical practices associated with clarity and grounding, though this is traditional lore.