blue to violet. Luster is vitreous.Crystal habits include the tabular, rectangular box often elongated in one direction forming a prismatic crystal. Most commonly massive and granular. Cleavage is in three directions forming rectangles, but perfect in one, very good in another and only marginally good in the third direction. Hardness is 3.5.anorthiteanortitMineral which belongs to plagioclase feldspar group with formula CaAl2Si2O8. Grey to dark grey in colour, other properties see feldspars.anticlineantiklinalaAn arched fold in which the rock layers usually dip away from the axis of the fold.apatiteapatitHexagonal mineral with formula Ca5(PO4,CO3)3(F,OH,Cl). Green, green-brown, yellow in colour. Hardness is 5. Columnar shape. Poorly cleavaged.aphaniticafanitickyPertaining to a texture of rocks in which the crystalline constituents are too small to be distinguished with the unaided eye. It includes both microcrystalline and cryptocrystalline textures.apliteaplitA dike rock consisting almost entirely of light-coloured mineral constituents and having a characteristic fine-grained granitic texture.aquiferzvodenA body of saturated rock or sediment through which water can move readily.arcosearkozaA sandstone in which more than 25% of the grains are feldspar.artesian wellarteska studnaA well in which water rises above the aquifer.asthenosphereastenosferaA region of the earth s outer shell beneath the lithosphere. The asthenosphere is of indeterminate thickness and behaves plastically.authigenous mineralsautigenni mineralyMinerals which occur on the place of their origin.barA ridge of sediment, usually sand or gravel, that has been deposited in the middle or along the banks of a stream by a decrease in stream velocity.basal slidingMovement in which the entire glacier slides along as a single body on its base over the underlying rock.basaltcedicA fine-grained, mafic, igneous rock composed predominantly of ferromagnesian minerals and with lesser amount of calcium-rich plagioclase feldspar. Mostly black.base leveluroven hloubky erozeA theoretical downward limit for stream erosion of the earth s surface.basic rocksbazicke vyvrele horninyIgneous rocks with relatively high percentage of mafic minerals and low percentage of silica (amount of SiO2 is between 44 and 52 %).batholithbatolitA large discordant pluton with an outcropping area greater than 100 square kilometers.beddingzvrstveniAn arrangement of layers or beds of rock.bedding planevrstevni plochaA nearly flat surface separating two beds of sedimentary rock.bedrockskalni podkladSolid rock that underlies soil.bentonitebentonitRock composed of clay minerals, mainly montmorillonite, formed mostly by decomposition in water or weathering on the Earth surface.biochemical sedimentary rocksbiochemicke sedimentyGeneral term for organic and chemical sedimentary rocks.biotitebiotitIron/magnesium bearing mica. Black to dark brown in colour, other properties see mica.blowoutA depression on the land surface caused by wind erosion.body wavesSeismic waves that travel through the earth s interior.bondingvazbyAttachment of an atom to one or more adjacent atoms.borelogzaznam vrtneho profiluGraphical report of a well.boulderbalvanA sediment particle with a diameter greater than 256 mm.boulder loamsouvkova hlinaGlacial sediment formed as a result of glacier accumulation, either in front of a glacier or on its base. It is mostly fine-grained material with larger fragments.brecciabrekcieA fragmental rock whose components are angular and therefore, as distinguished from conglomerates, are not waterworn.buttesvedecka horaA narrow pinnacle of resistant rock with a flat top and very steep sides.calcitekalcitMineral with the formula CaCO3. Mostly white, yellow or grey in colour, cleavaged, glassy luster on cleavage planes, hardness is 3, streak is always white. Reacts strongly