rock identification laban swers

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ROCK IDENTIFICATION LAB What type of rock is this? Where or how is it formed? Obsidian     Mafic (black) Extrusive Igneous Rock No crystals formed Glassy Very quick cooling molten rock (lava) What type of rock is this? Where or how is it formed? Basalt    Mafic Extrusive Igneous Rock Fine grained (some small crystals) Formed from dark dense lava  Pyroxene, plagioclase feldspar What type of rock is this? Where or how is it formed? Scoria     Mafic Extrusive Igneous Rock No crystals formed Forms as a frothy crust on the top of a lava flow or as material ejected from a volcanic vent and solidifying while airborne Many holes formed - gasses released What type of rock is this? Where or how is it formed? Pumice      Felsic Extrusive Igneous Rock No crystals formed Quick cooling molten rock (lava) Many holes formed - gasses released Floats on water What type of rock is this? Where or how is it formed? What type of rock is this? Where or how is it formed? Quartzite     Metamorphic Rock Non-Foliated Individual quartz grains have recrystallized but are too small too see Metamorphism of Sandstone What type of rock is this? Where or how is it formed? Marble     Metamorphic Non-Foliated Made of mostly small to medium sized calcite crystals Metamorphism of Limestone What type of rock is this? Where or how is it formed? Gneiss     Metamorphic Foliated – pink and grey alternating bands Medium to coarse grained texture Metamorphism of Granite What type of rock is this? Where or how is it formed? Slate     Metamorphic Rock Foliated Breaks into thin “slices” Metamorphism of Shale What type of rock is this? Where or how is it formed? Hornfels     Metamorphic Rock Non-foliated Fine grained crystals Metamorphism of clays or Shales Comparisons  Basalt vs Slate  Both dark colors  Basalt is  igneous and Slate is metamorphic Pumice vs Basalt  Both igneous made of quick cooling lava (extrusive)  Pumice is felsic and Basalt is mafic  Granite vs Gneiss  Both have course grains/crystals  Granite is igneous and Gneiss is metamorphic Comparisons  Scoria vs Pumice  Both are porous (have air bubbles/holes)  Scoria is mafic and Pumice is felsic  Obsidian vs Coal  Both are black, no crystals  Obsidian is igneous and Coal is sedimentary  Marble vs Limestone  Both are made of calcite  Marble is metamorphic and Limestone is sedimentary Comparisons  Slate vs Shale  Both thin slices, made of mud and clay, dark color  Slate is metamorphic (morphed from shale), Shale is sedimentary  Hornfels vs Slate  Both metamorphic rocks made from Shale  Hornfels is not foliated and Slate is foliated  Sandstone vs Quartzite  Both grainy and made of Quartz  Sandstone is sedimentary and Quartzite is metamorphic Comparisons  Limestone vs Marble  Both are made of calcite  Limestone is sedimentary and Marble is metamorphic  Conglomerate vs Limestone  Both sedimentary rocks formed in or near water  Conglomerate is clastic (made of pebbles cemented together by moving water) and Limestone is organic (made of shell coral, fecal debri found in shallow water)  Gneiss vs Granite Comparisons  Quartzite vs Sandstone  Both contain the mineral Quartz  Quartzite is metamorphic (pressure and heat), Sandstone is sedimentary (cemented together by water +sandstone or lime)  Coal vs Obsidian  Both are black and smooth and contain no crystals  Coal is sedimentary and Obsidian is igneous  Shale vs Slate  Both made of mud and clay (Slate is made from [...]... Felsic Intrusive Igneous Rock Coarse Grained - can see crystals Contains quartz and feldspar What type of rock is this? Where or how is it formed? Shale    Clastic Sedimentary Rock Thin, dark gray sheets – easily broken Formed from mud and clay being pressed together What type of rock is this? Where or how is it formed? Image Source Sandstone     Clastic Sedimentary Rock Light red/dark pink... waters What type of rock is this? Where or how is it formed? Conglomerate    Clastic Sedimentary Rock Red with rounded pebbles cemented together Formed near moving water What type of rock is this? Where or how is it formed? Quartzite     Metamorphic Rock Non-Foliated Individual quartz grains have recrystallized but are too small too see Metamorphism of Sandstone What type of rock is this? Where... type of rock is this? Where or how is it formed? Gneiss     Metamorphic Foliated – pink and grey alternating bands Medium to coarse grained texture Metamorphism of Granite What type of rock is this? Where or how is it formed? Slate     Metamorphic Rock Foliated Breaks into thin “slices” Metamorphism of Shale What type of rock is this? Where or how is it formed? Hornfels     Metamorphic Rock. .. silica or lime Most form in shallow seas What type of rock is this? Where or how is it formed? Image Source Coal    Organic Sedimentary Rock Black, smooth and lightweight Formed from layers of plant remains that are pressed together over time What type of rock is this? Where or how is it formed? Image Source Limestone    Organic Sedimentary Rock Calcium Carbonate - calcite Forms from the accumulation... vs Slate  Both metamorphic rocks made from Shale  Hornfels is not foliated and Slate is foliated  Sandstone vs Quartzite  Both grainy and made of Quartz  Sandstone is sedimentary and Quartzite is metamorphic Comparisons  Limestone vs Marble  Both are made of calcite  Limestone is sedimentary and Marble is metamorphic  Conglomerate vs Limestone  Both sedimentary rocks formed in or near water
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