Basalt

1
Basalt
Extrusive igneous form of basaltic lava. Found
covering the ocean floor and spilling from the
Hawaiian volcanoes.
2
Scoria
Extrusive igneous rock formed from basaltic lava.
Garden rock.
3
Gabbro
Intrusive igneous rock formed from basaltic magma.
4
Andesite
Extrusive igneous rock formed from andesitic lava
5
Diorite
Intrusive igneous rock formed from andesitic
magma.
6
Pumice
Extrusive igneous rock formed from granitic lava.
Floats in water.
7
Obsidian
Extrusive igneous rock formed by granitic lava
cooling very rapidly.Used to make arrowheads.
8
Rhyolite
Extrusive igneous form of granitic lava
9
Granite
Intrusive igneous rock containing quartz,
feldspar and mica. Forms the backbone of the
Rockies, Mt. Rushmore.
10
Gneiss
Metamorphic form of granite. Found in the
Beartooth Mountains.
11
Phyllite
Metamorphic rock formed from slate. Contains mica
flakes
12
Schist
Metamorphic rock formed from basalt or phyllite.
13
Marble
Metamorphic rock formed from limestone. Fizzes
with acid, indicating it contains calcite.
14
Slate
Metamorphic rock formed from the metamorphism of
shale.
15
Athracite coal
Metamorphic rock formed from bituminous coal.
16
Limestone
Sedimentary rock formed from bones and shells of
sea creatures and compaction or coral reefs.
17
Shale
Sedimentary rock formed from clay settling on the
lake or sea bottom
18
Sandstone
Sedimentary rock formed by compacting and
cementing quartz particles into rock
19
Conglomerate
Sedimentary rock formed by cementing rounded
pebbles together.
20
Coquina
Sedimentary rock formed from cementation of
shells fragments
21
Bituminous Coal
Sedimentary rock formed from the compaction of
peat.
22
Siltstone
Sedimentary rock formed from compaction of silt.