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.

Subscribe via EMail to the GeoWord of the Day.


balas ruby (bal'-as). A pale rose-red or orange gem variety of spinel, found in Badakhshan (or Balascia) province in northern Afghanistan. See also: ruby spinel. Syn: ballas.

Giggenbach bottle . An evacuated alkaline-solution-filled bottle (e.g., sodium hydroxide, NaOH), generally connected to a titanium or silica tube which is inserted into a fumarole. The gases bubble through the solution, condense, and are absorbed by the solution, which can be analyzed (William-Jones and Rymer, 2000).

statospore (stat'-o-spore). A resting spore, e.g. a siliceous thick-walled resistant cyst formed within the frustules of various chiefly marine centric diatoms, and characterized by two overlapping convex valves and by absence of a girdle; or an intracellular cyst in various algae of the division Chrysophyta.

slieve . An Irish term for a mountain.

quasicratonic (qua''-si-cra-ton'-ic). Said of semiconsolidated regions in which paratectonic deformation ( germanotype tectonics ) tends to dominate (Stille, 1940). Obsolete. Syn: semicratonic.

assay (as'-say). v. In economic geology, to analyze the proportions of metals in an ore; to test an ore or mineral for composition, purity, weight, or other properties of commercial interest. n. The test or analysis itself; its results.

arsenowaylandite . An ill-defined arsenic analogue of waylandite: (Bi3+,Sr)(Al,Fe)3(AsO4,PO4)2(OH)6. A member of the crandallite group. Not approved by the International Mineralogical Association.

remnant arc . A fossil volcanic arc commonly in the back-arc position of an active arc.

creaseyite (crea'-sey-ite). A pale green or yellowish orthorhombic mineral: Pb2Cu2Fe3+2Si5O17•6H2O .

wool . An English term for a sandy shale or shaly flagstone with irregular curly bands or bedding.

Pages

Subscribe to GeoWord of the Day