allotriomorphic-granular . Obsolete syn. of xenomorphic-granular.
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.
fransoletite (fran-so-let'-ite). A colorless monoclinic secondary mineral: Ca3Be2(PO4)2(PO3OH)2•4H2O . A dimorph of parafransoletite.
meta-uranospinite met-a-u-ran'-o-spin''-ite). A yellow tetragonal secondary mineral: Ca(UO2)2(AsO4)2•8H2O. It is a lower hydrate of uranospinite.
ladder vein . One of a series of mineral deposits in transverse, roughly parallel fractures that have formed along foliation planes perpendicular to the walls of a dike during its cooling, or along shrinkage joints in basaltic rocks or dikes. Syn: ladder lode; ladder reef.
bar plain . A term introduced by Melton (1936, p.594, 596) for a relatively smooth floodplain with neither a low-water channel nor an alluvial cover, and characterized by a network of elongate and irregularly sized "bars" built from "the tractional and suspended load in the declining stages of the last flood". Cf: meander plain; covered plain.
polygonomorph (pol-y-gon'-o-morph). Of an acritarch vesicle, having a polygonal outline (e.g., Veryhachium, Stellinium, Estiastra ) and typically simple processes (Downie et al., 1963). Also such a vesicle.
datum gravity . The arbitrary reference surface to which corrections are applied.
phenetics . A set of numerical techniques that group taxa based on overall morphologic similarity. Although common in the 1960s and 70s, it is now rarely used. Syn: numerical taxonomy.
assay ton . A weight of 29.1667 grams, used in assaying to represent proportionately the assay value of an ore. Since it bears the same ratio to one milligram that a ton of 2,000 pounds bears to the troy ounce, the weight in milligrams of precious metal obtained from an assay ton of ore equals the number of ounces to the ton. Abbrev: AT.
sapanthracite (sap-an'-thra-cite). Sapropelic coal of anthracitic rank; it is the highest stage in the sapropelic series. Cf: humanthracite.
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