Tumbled Flint
Quartz var. Flint · Mineral Specimen
Crystal System
Trigonal, massive microcrystalline habit
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Sedimentary, chemical precipitation of silica in marine environments
About This Crystal
A smooth, water-worn, rounded grey pebble with a dull, matte luster and opaque transparency.
Physical Characteristics
Grey body color, white streak, no cleavage, conchoidal fracture, specific gravity around 2.60, brittle tenacity
Optical Properties
Singly refractive aggregate, microcrystalline, non-pleochroic
Hardness & Durability
Origin Region
Worldwide, commonly found in chalk and limestone formations
Hardness & Durability
Mohs hardness of 7, high toughness due to microcrystalline structure, highly durable
Care & Maintenance
Wash with warm soapy water, no special chemical sensitivities
Rarity & Value
Very common, low commercial value, no treatments typically applied
Special Characteristics
Conchoidal fracture producing extremely sharp edges when broken, historically used for making tools and striking fire
Lore & History
Used extensively by prehistoric humans for stone tools, arrowheads, and fire-making. In modern crystal lore, it is associated with grounding, protection, and clearing negative energy.