2017-07-29T02:47:17+03:00[Europe/Moscow] en true Tuff, Bauxite, Molasse, Tektite, Moldavite, Jasper, Rock (geology), Fulgurite, Xenolith, Serpentinite, Fold (geology), Charoite, Geode, Metamorphic rock flashcards


  • Tuff
    Tuff (from the Italian tufo) is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption.
  • Bauxite
    Bauxite, an aluminium ore, is the world's main source of aluminium.
  • Molasse
    The term "molasse" refers to the sandstones, shales and conglomerates formed as terrestrial or shallow marine deposits in front of rising mountain chains.
  • Tektite
    Tektites (from Greek τηκτός tēktós, "molten") are gravel-size bodies composed of black, green, brown or gray natural glass formed from terrestrial debris ejected during meteorite impacts.
  • Moldavite
    Moldavite (Czech: Vltavín) is an olive-green or dull greenish vitreous substance possibly formed by a meteorite impact in southern Germany (Nördlinger Ries), which would make it one kind of tektite.
  • Jasper
    Jasper, an aggregate of microgranular quartz and/or chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.
  • Rock (geology)
    (For other uses of "Rock", see Rock (disambiguation).)("Rocks" and "Stone" redirect here. For other uses, see Rocks (disambiguation) and Stone (disambiguation).) In geology, rock or stone is a naturally occurring solid aggregate of one or more minerals or mineraloids.
  • Fulgurite
    Fulgurites (from the Latin fulgur, meaning "lightning") are classified generically as a variety of the mineraloid lechatelierite, although their absolute chemical composition is dependent on the physical and chemical properties of target material affected by the discharge of cloud-ground lightning.
  • Xenolith
    A xenolith (Ancient Greek: "foreign rock") is a rock fragment which becomes enveloped in a larger rock during the latter's development and hardening.
  • Serpentinite
    Serpentinite is a rock composed of one or more serpentine group minerals.
  • Fold (geology)
    A geological fold occurs when one or a stack of originally flat and planar surfaces, such as sedimentary strata, are bent or curved as a result of permanent deformation.
  • Charoite
    Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O) is a rare silicate mineral, first described in 1978 and named for the Chara River.
  • Geode
    Geode (Greek γεώδης - ge-ōdēs, "earthlike") are geological secondary structures which occur in certain sedimentary and volcanic rocks.
  • Metamorphic rock
    Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form".