c Mostly very fine grained to Micritic h microcrystalline calcite and/or limestone e microfossils m Porous, poorly cemented mass i Coquina of shells and shell fragments c a Mainly fossils Mostly very fined grained, l shells, fragments earthy, chalky, light-colored or microfossils mass of microfossils and calcite Limestone crystals Chalk Effervesces in HCl Spherical grains like tiny beads Oolitic with concentric laminations limestone Mostly medium to coarse Crystalline crystals of calcite limestone I n Mainly dolomite Effervesces in Dolostone o CaMg(CO3)2 HCl if powdered r g a Mainly varieties scratches Chert n of silica Conchoidal i fracture c Crystals formed as Can be Mainly gypsum inorganic scratched with Rock Gypsum CaSO4·2H2O chemical your fingernail precipitation Crystalline limestone is composed of tight interlocking calcite crystals that are large enough to see with the naked eye. Crystalline limestone is commonly formed in shallow seas.
c h e m i c a l Mainly fossils shells, fragments or microfossils and calcite crystals Effervesces in HCl Mostly very fine grained to microcrystalline calcite and/or microfossils Limestone Micritic limestone Porous, poorly cemented mass of shells and shell fragments Coquina Mostly very fined grained, earthy, chalky, light-colored mass of microfossils Chalk I n o r g a n i c Spherical grains like tiny beads with concentric laminations Oolitic limestone Mostly medium to coarse crystals of calcite Crystalline limestone Mainly dolomite CaMg(CO3)2 Effervesces in HCl if powdered Dolostone Mainly varieties of silica Conchoidal fracture scratches Chert Mainly gypsum CaSO4·2H2O Crystals formed as inorganic chemical precipitation Can be scratched with your fingernail Rock Gypsum Crystalline limestone is composed of tight interlocking calcite crystals that are large enough to see with the naked eye. Crystalline limestone is commonly formed in shallow seas.
Rocks.docx