rock identification laban swers

 Mafic Extrusive Igneous Rock  Fine grained some small crystals  Formed from dark dense lava  Pyroxene, plagioclase feldspar...  Clastic Sedimentary Rock  Thin, dark gray sheets –

ROCK IDENTIFICATION

LAB

What type of rock is this? Where or how is it formed?

What type of rock is this? Where or how is it formed?

 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?

 Many holes formed - gasses released

What type of rock is this? Where or how is it formed?

 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?

 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?

 Clastic Sedimentary Rock

 Thin, dark gray sheets – easily broken

 Formed from mud and clay being pressed together

Image Source

What type of rock is this? Where or how is it formed?

 Clastic Sedimentary Rock

 Light red/dark pink with very small pieces of sand

 Quartz cemented by silica or lime

 Most form in shallow seas

Image Source

What type of rock is this? Where or how is it formed?

 Organic Sedimentary Rock

 Black, smooth and lightweight

 Formed from layers of plant remains that are pressed together over time

Image Source

What type of rock is this? Where or how is it formed?

 Organic Sedimentary Rock

 Calcium Carbonate - calcite

 Forms from the accumulation of shell, coral, and fecal debris in clear, warm, shallow marine waters

What type of rock is this? Where or how is it formed?

 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?

 Metamorphism of Sandstone

What type of rock is this? Where or how is it formed?

What type of rock is this? Where or how is it formed?

What type of rock is this? Where or how is it formed?

What type of rock is this? Where or how is it formed?

 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

 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

 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

 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

 Both contain course grain crystals

 Gneiss is metamorphic and Granite is igneous

 Quartzite vs Sandstone

 Both contain the mineral Quartz

 Quartzite is metamorphic (pressure and heat),

Sandstone is sedimentary (cemented together by water + sandstone or lime)