Essentially synonymous with matrix.groundwaterpodzemni vodaThe water that lies beneath the ground surface, filling the cracks, crevices, and pore space of rocks.gypsumsadrovecMineral with formula CaSO4. It is formed by evaporation. Clear, white, light grey in colour. Hardness is 2. Vitreous to pearly luster, brittle sheets. Perfect cleavage.habithabitusTerm describing shape of a crystal (e.g. tabular, columnar).halitesul kamennaMineral with formula NaCl. It is formed by evaporation. Clear to grey in colour. Hardness is 2.5. Perfect cleavage. Salty taste.hanging valleyvisute udoliA smaller valley that terminates abruptly high above a main valley.headward erosionzpetna erozeThe lenghtening of a valley in an uphill direction above its original source by gullying, mass wasting, and sheet erosion.hematitehematit(1) Mineral with formula Fe2O3. Mostly fine grained, reddish brown in colour. Hardness is 1.5 to 5.5, dull luster. It occurs in form of earthy masses. It is product of chemical weathering (oxidation). (2) Rarely with formula Fe3O4, steel grey to dull red in colour. Hardness is 6. May be micaceous (tiny flakes) or massive.hemicrystalline rockshemikrystalicke horninyVolcanic rocks, which have cooled very quickly. Part of rock mass is composed of volcanic glass.hinge lineosa vrasyLine about which a fold appears to be hinged. Line of maximum curvature of a folded surface.hinge planerovina vrasySee axial plane.holocrystalline rocksholokrystalicke horninyIgneous rocks with fully crystalized rock mass.horizontal beddinghorizontalni zvrstveniType of bedding, where layers are oriented horizontally.hornblendeobecny amfibolCommon amphibole frequently found in igneous and metamorphic rocks. Properties see amphibole.hornfelskontaktni rohovecA fine-grained, unfoliated metamorphic rock.horsthrastAn up-raised block bounded by normal faults.hyaline texturehyalinni strukturaTexture of volcanic rocks or their groundmass, which is formed by amorphous substance.hydraulic conductivitykoeficient filtraceNumber characterizing permeability of rocks.hydraulic gradienthydraulicky gradientThe ratio between vertical difference of heights of two water tables and their horizontal distance.hydrologic cyclehydrologicky cyklusThe movement of water and water vapor to the atmosphere, to the land, and to the atmosphere again.hypidiomorphic mineralshypidiomorfne omezene mineralyPartly confined mineral grains formed during crystallization of magma.hypocenterhypocentrum zemetreseniSynonym for the focus of an earthquake.chalkkridaA very fine-grained bioclastic limestone, which often forms high white cliffs on the coast.chalkopyritechalkopyritMetallic mineral with formula CuFeS2. Golden yellow or greenish yellow in colour. Hardness is 3.5 to 4. Massive.chemical sedimentary rockschemicke sedimentarni horninyA sedimentary rocks composed of material precipitated directly from solution.chemical weatheringchemicke zvetravaniThe decomposition of rock resulting from exposure to water and atmospheric gases.chertrohovecA hard, compact, fine-grained sedimentary rock formed almost entirely of silica.chloritechloritMineral belonging to mica group formed mostly during metamorphism. It can be also formed by alteration processes. Green to blackish green in colour. Dull to pearly luster. Hardness 2 to 2.5. May have faint green-yellow streak. Crystal flakes are flexible but not elastic. Finely crystalline aggregates common.ice capledovcova capkaA glacier covering a relatively small area of land but not restricted to a valley.ice sheetkontinentalni ledovecA glacier covering a large area (more than 50 000 square kilometers) of land.icebergledovecBlock of glacier-derived ice floating in water.idiomorphic mineralsidiomorfne omezene mineralyCompletely confined mineral grains formed during crystallization of magma.igneous rocksvyvrele horninyA rocks formed or apparently formed from solidification of magma.illiteillitNon-swelling type of clay mineral. Properties see clay minerals.inner corevnitrni jadroThe most inner part of the Earth.intermediate igneous rocksintermediarni vyvrele horninyIgneous rocks with a chemical content between felsic