Color: Color
ranges from creamy white or whitish gray to pale blue or yellowish brown with yellow and brown streaking
Texture: Fine grain
Luster:
Translucency:
Silica Fabrics / Fossils: includes
brachiopods, horn coral, bryozoa, sponge spicules, and crinoid columns.
Patina:
Heat Treatment: Heat treatment produces
colors of grays, pinks, and tans with occasional bands of reds and
purples. Heat treatment increases the luster.
Knapping: Knapping non-heat treated
material is difficult, but increases knappability when heat treated.
Distribution:
Distribution Comments:
Keokuk Chert is associated with the Keokuk Member of the Burlington
Limestone Formation of Illinois,
Missouri, and southeastern Iowa. Primary outcroppings are found in Hancock County,
Illinois.
Projectile point made from this material:
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