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n. A variety of silica that contains microcrystalline quartz.

n. A siliceous rock of chalcedonic or opaline silica occurring in limestone.

n. Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or other flint-like mineral.

n. A flint-like tool made from chert.

n. An impure, massive, flintlike quartz or hornstone, of a dull color.

n. A cryptocrystalline variety of quartz, also called hornstone, petrosilex, or rock-flint.

n. variety of silica containing microcrystalline quartz

"The Lake Superior iron formations now consist near the surface mainly of interbanded quartz (or chert) and hematite, called _jasper_ or _ferruginous chert_ or _taconite_."

silica    silicon dioxide    silicon oxide   

quartzite    silicate    flint    chalcedony    jasper   

taconite   

Bert    Curt    Evert    Insert    Kurt    alert    assert    avert    birt    blurt   

pit-coal    cornelian    schisti    single-bladed    lochaber    mithril    bloodstone    broad-bladed    well-honed    plaister