Chert

Science / Geology / Chert: A microcrystalline or cryptocrystalline sedimentary rock material composed of SiO2. Occurs as nodules and concretionary masses and less frequently as a layered deposit. Picture of Chert.

Threefold Death

Entertainment / Literature / Threefold Death: According to Dan Wiley's entry in Duffy's Medieval Ireland: An Encyclopedia, threefold death is a motif of the early Irish aideda in which a victim is killed by three different means in rapid successi MORE

Nodule

Science / Geology / Nodule: A mineral mass that has a different composition or is more weathering resistant than its surrounding rock. These are normally rounded in shape. Examples include: chert masses in a limestone rock unit, MORE

Jasper

Science / Geology / Jasper: A variety of colored chert, typically red or green and often found in association with iron ores. Jasper is frequently used as a gemstone or in the production of ornaments. MORE

Banded Iron Ore

Science / Geology / Banded Iron Ore: A rock that consists of alternating layers of chert and iron oxide mineral (usually hematite) with the iron oxide in high enough concentration to be of economic value. MORE

Chemical Sedimentary Rock

Science / Geology / Chemical Sedimentary Rock: A rock that forms from the precipitation of mineral material from solution. Examples are chert and rock salt. MORE

Links
Home
Glossary
Thesaurus