bandaite (ban'-da-ite). An andesite containing labradorite or bytownite. It was named by Iddings in 1913 for Bandai San, Japan. Obsolete.
GeoWord of the Day
The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.
lepidolith (le-pid'-o-lith). A thin, apparently homogeneous, elliptical coccolith; e.g. a surface plate of the coccolithophorid Thorosphaera flagellata.
wall [mining] . The side of a lode, or of mine workings. Cf: footwall; hanging wall.
katamorphism (kat-a-mor'-phism). Destructive metamorphism in the katamorphic zone, at or near the Earth's surface, in which complex minerals are broken down and altered through oxidation, hydration, solution, and allied processes to produce simpler and less dense minerals. The term was introduced by Van Hise in 1904. Obsolete. Also spelled: catamorphism. Cf: anamorphism.
sand snow . Cohesionless dry snow that has fallen at such cold temperatures (usually below -25°C) that intergranular adhesion is inhibited and surface friction is high. Its surface has the consistency of dry sand. Cf: powder snow.
blackjack [sed] . A term used in Arkansas for a soft, black carbonaceous clay or earth associated with coal.
heel . Upwardly convex posterior segment of the upper margin of conodont elements of Belodina (TIP, 1981, pt. W, supp.2).
cerioid (cer'-i-oid). Said of a massive corallum in which the walls of adjacent polygonal corallites are closely united.
Corey shape factor . A measure of the sphericity of a sediment particle equal to DS/(DLDI)1/2, where DS = shortest diameter, DL = longest diameter, and DI = intermediate diameter (Corey, 1949). Cf: maximum projection sphericity.
dry weathering . Mechanical weathering of a rock without the action of water, as in an arid region.
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