platy structure
31Post-perovskite — is a high pressure phase of MgSiO3, is composed of the prime oxide constituents of the Earth s rocky mantle (MgO and SiO2), and its pressure and temperature for stability imply that it is likely to occur in portions of the lowermost few hundred… …
32Greek literature — Introduction body of writings in the Greek language, with a continuous history extending from the 1st millennium BC to the present day. From the beginning its writers were Greeks living not only in Greece proper but also in Asia Minor, the… …
33Molybdenite — Euhedral molybdenite on quartz, Molly Hill mine, Quebec, Canada. The large crystal is 15mm across General Category Sulfide mineral …
34Canadian system of soil classification — The Canadian system of soil classification is more closely related to the American system than any other. They differ in several ways. The Canadian system is designed to cover only Canadian soils. The Canadian system dispenses with a sub order… …
35List of medical roots, suffixes and prefixes — This is a list of roots, suffixes, and prefixes used in medical terminology, their meanings, and their etymology. There are a few rules when using medical roots. Firstly, prefixes and suffixes, primarily in Greek, but also in Latin, have a… …
36heulandite — /hyooh leuhn duyt /, n. a white or transparent, colorless mineral of the zeolite family, hydrous calcium aluminum silicate, CaAl2Si7O18·6H2O, occurring in basic volcanic rocks in the form of crystals with a pearly luster. [1815 25; named after… …
37silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… …
38Alcaloïde pyrrolizidinique — Les alcaloïdes pyrrolizidiniques forment une classe d alcaloïdes et de métabolites secondaires, caractérisés par une structure pyrrolizidine formée de deux cycles pyrroles. Il n a été trouvé aucune application thérapeutique à ces alcaloïdes et c… …
39Kaolinite — Kaolin General Category Silicate mineral Chemical formula Al2Si2O5(OH)4 …
40Tuff — (from the Italian tufo ) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff should not be confused with tufa , another type of rock. Volcanic ashThe products of a volcanic eruption are… …
