fasinite (fas'-i-nite). A coarse-grained melteigite that contains titanian augite and nepheline as its main components along with alkali feldspar, olivine, and biotite. It has the same chemical composition as berondrite and differs from bekinkinite by the absence of hornblende and analcime. The name, given by Lacroix in 1916, is derived from Ampasindava, Malagasy. 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.
phytocollite (phy-to-col'-lite). A black gelatinous nitrogenous humic body occurring beneath or within peat deposits. Cf: dopplerite.
Aquepts . Inceptisols that are saturated with water for periods long enough to limit their use for most crops other than pasture or woodland unless they are artificially drained. Aquepts have either a histic or umbric epipedon and gray colors within 50 cm of the surface, or an ochric epipedon underlain by a cambic horizon with gray colors, or have sodium saturation of ≥15%. A suborder in the U.S. system of soil taxonomy.
growan (gro'-wan). (a) An old English term for a coarse-grained granite, grit, or sandstone. (b) A grus developed by the disintegration of a granite.
stratigraphic facies . Facies distinguished primarily on the basis of form, nature of boundaries, and mutual relations, to which appearance and composition are subordinated (Weller, 1958, p.627). These facies are all stratigraphic bodies of one kind or another; they may occur in vertical succession and have boundaries that are more or less horizontal stratigraphic planes (e.g. systems, formations, biostratigraphic zones, and lithostromes), or they may be laterally intergrading parts of some kind of a stratigraphic unit and separated at more or less arbitrary vertical cutoff boundaries (e.g. lithofacies), or they may bear both lateral and vertical relations to each other and have irregular boundaries (e.g. the magnafacies of Caster, 1934). See also: facies. Cf: petrographic facies.
isochalcopyrite (i'-so-chal'-co-py'-rite). A metallic cubic mineral found in Red Sea mud: (Fe,Cu)S. Not approved by the International Mineralogical Association.
granularity (gran-u-lar'-i-ty). The quality, state, or property of being granular; specif. one of the component factors of the texture of a crystalline rock, including both grain size and grain-size distribution. Granularity and grain relationships define textures, which, together with orientation, are included in the definition of fabric (in Sander's sense). Friedman (1965, p.647) used the term to refer to the "size and mutual relations of crystals" in a sedimentary rock such as an evaporite, a chemically deposited cement, or a recrystallized limestone or dolomite.
tapetum (ta-pe'-tum). Tissue of nutritive cells in the sporangium of embryophytic plants, digested during development of the spores. In angiosperms, it is the inner wall of the anther locules and provides nutritive substances for the developing pollen. Pl: tapeta.
chelyabinskite . A white orthorhombic mineral, product of a burning coal dump: (Ca,Mg)3Si(OH)6(SO4,CO3)2•9H2O. Not approved by the International Mineralogical Association.
mass spectrum . The pattern of relative abundances of ions of different atomic or molecular mass (mass-to-charge ratio) within a sample. It frequently refers to the measured relative abundances of various isotopes of a given element.
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