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rock cycle-rock classification

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rock cycle-rock classification Powered By Docstoc
					Type                        Characteristics Examples
Sedimentary                 Layered
                            Fossils
                            conglomerates
Metamorphic                 Smooth
                            Stripes
                            Wavy, ribbon-like
                            layers
                            Foliated (layers)or
                            non-foliated (no
                            layers)
                            Small crystals
igneous                     Small to medium
                            crystals
                            large holes
                            glassy
Foliated metamorphic rock-____________________________________________

Non-foliated metamorphic rock-________________________________________



Intrusive igneous rock usually have larger crystals than extrusive rock
because_______________________________________________________________________

Deposition of sediment




Rock classification guide

Sedimentary

SHALE-clastic sedimentary rock that is made up of clay-size weathering debris. It typically breaks into thin flat pieces

BRECCIA- an iron-stained mix of red-orange clay through sand-size particles

SANDSTONE-foliated metamorphic rock that is formed through the metamorphism of shale. It is a low grade metamorphic rock that
splits into thin pieces
CONGLOMERATE-clastic sedimentary rock that contains large rounded clasts. The space between the clasts is generally filled with
smaller particles and/or a chemical cement that binds the rock together.

LIMESTONE-Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite.

COAL- Black, burns readily, rich in carbon




Metamorphic

SLATE-foliated metamorphic rock that is formed through the metamorphism of shale. It is a low grade metamorphic rock that splits
into thin pieces

MARBLE-non-foliated metamorphic rock that is produced from the metamorphism of limestone. It is composed primarily of calcium
carbonate

QUARTZITE-non-foliated metamorphic rock that is produced by the metamorphism of sandstone. It is composed primarily of quartz.

GNEISS-foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. It typically contains
abundant quartz or feldspar minerals.

SCHIST-Schist is metamorphic rock with well developed foliation. It often contains significant amounts of mica which allow the rock
to split into thin pieces. It is a rock of intermediate metamorphic grade between phyllite and gneiss




Igneous

OBSIDIAN-black or brown volcanic rock that appears very glassy

GRANITE-coarse-grained, light colored usually white gray and beige, intrusive igneous rock that contains mainly quartz and feldspar
minerals

BASALT-fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene

SCORIA- a dark-colored, vesicular, extrusive igneous rock. The vesicles are a result of trapped gas within the melt at the time of
solidification. It often forms as a frothy crust on the top of a lava flow or as material ejected from a volcanic vent and solidifying while
airborne

RHYOLITE-a light-colored, fine-grained, extrusive igneous rock that typically contains quartz and feldspar minerals

				
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posted:11/25/2011
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