Flint
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Mineral NameFlint
Chemical FormulaSiO2
Mohs Hardness6.5
Crystal Systemamorphous
Lusterwaxy
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.6
Colorsbrown, yellowish-brown, grey
Transparencytranslucent
Type LocalityLeugny, Les Goujons, France
Mineral GroupSilicates
Usesstone tools, building material, abrasives
Raritycommon
Description
A large, irregularly shaped core of yellowish-brown flint, exhibiting a waxy luster on some surfaces and a lighter, weathered cortex. It shows characteristic conchoidal fracture surfaces.
Geological Context
Flint forms as concretions in sedimentary rocks, particularly chalk and limestone, through the precipitation of silica from groundwater. It is a common material for prehistoric tools due to its sharp edges when fractured.
