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Transcript 
ROCK IDENTIFICATION
Liz LaRosa
http://www.middleschoolscience.com 2009
What type of rock is this? Where or how is it formed?
Marble
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Metamorphic
Non-Foliated
Calcium Carbonate
Metamorphism of Limestone
What type of rock is this? Where or how is it formed?
Image Source
Limestone
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Sedimentary
Calcium Carbonate
Forms in clear, warm, shallow marine waters
Forms from the accumulation of shell, coral,
algal and fecal debris
What type of rock is this? Where or how is it formed?
Granite
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Intrusive Igneous Rock
Most are Felsic
Coarse Grained, can see crystals
Contains quartz and feldspar
What type of rock is this? Where or how is it formed?
Gneiss
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Metamorphic
Foliated
Feldspar
What type of rock is this? Where or how is it formed?
Image Source
Coal
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Organic Sedimentary Rock
Formed from plant remains
What type of rock is this? Where or how is it formed?
Obsidian
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Extrusive Igneous Rock
Very quick cooling molten rock (lava)
Glassy
No crystals formed
What type of rock is this? Where or how is it formed?
Image Source
Sandstone
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Sedimentary Rock
Formed by the action of wind, water, and
ice on older rock
Quartz cemented by silica or lime
Most form in shallow seas
What type of rock is this? Where or how is it formed?
Pumice
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Felsic Extrusive Igneous Rock
Quick cooling molten rock (lava)
No crystals formed
Many holes formed - gasses released
Floats on water
What type of rock is this? Where or how is it formed?
Scoria
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Mafic Extrusive Igneous Rock
Forms as a frothy crust on the top of a lava
flow or as material ejected from a volcanic
vent and solidifying while airborne
No crystals formed
Many holes formed - gasses released
What type of rock is this? Where or how is it formed?
Basalt
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Mafic Extrusive Igneous Rock
Formed from dark dense lava
Pyroxene, plagioclase feldspar
Fine grained
What type of rock is this? Where or how is it formed?
Slate
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Foliated Metamorphic Rock
Metamorphism of Shale
Breaks into thin “slices”
What type of rock is this? Where or how is it formed?
Hornfels
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Non-Foliated Metamorphic Rock
Fine grained crystals
Metamorphism of clays or shales
What type of rock is this? Where or how is it formed?
Conglomerate
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Sedimentary Rock
Rounded pebbles ¼ inch or larger
cemented together
Formed near moving water
Quartz, quartzite
Review
Can you compare and contrast the following sets of
rocks?
 Limestone
and Marble
 Granite and Gneiss
 Obsidian and Coal
 Sandstone, Pumice, and Scoria
 Basalt, Hornfels, and Slate
 Conglomerate and all the other rocks
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