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?
Granite
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 with very small
pieces of sand
Quartz cemented by 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 of
shell, coral, and fecal debris in
clear, warm, shallow marine 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 or how is it
formed?
Marble
Metamorphic
Non-Foliated
Made of mostly small to medium
sized calcite crystals
Metamorphism of Limestone
