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.

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analytical model . A model in which the relationships among parameters can be solved using classical mathematical tools, such as differential equations (National Academy, 1994). Cf: numerical model .

jimboite (jim'-bo-ite). A light purplish-brown orthorhombic mineral: Mn2+3(BO3)2 . It is the Mn2+ analogue of kotoite.

amicite (am-ic'-ite). A colorless monoclinic zeolite mineral: K2Na2Al4Si4O16•5H2O .

vlasovite (vla'-sov-ite). A colorless, pink, pale brown, or silvery monoclinic or triclinic mineral: Na2ZrSi4O11 .

double reflection . The phenomenon whereby an X-ray diffracted by a set of lattice planes fortuitously satisfies the Bragg equation for another set of lattice planes in the crystal, and thus undergoes a second diffraction. The phenomenon occurs in neutron diffraction and electron diffraction as well. Syn: Renninger effect .

priceite (price'-ite). A snow-white earthy monoclinic mineral: Ca2B5O7(OH)5•H2O . Syn: pandermite.

progenitor (pro-gen'-i-tor). In biology, an ancestor.

mantle [cryst] (man'-tle). The outer zone in a zoned crystal; an overgrowth.

cebaite-(Nd) . A vitreous beige Nd analogue of cebaite-(Ce). Not approved by the International Mineralogical Association.

perched aquifer . An aquifer containing perched groundwater.

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