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Rocks and Minerals Test Review KEY
TERMS TO KNOW….
Streak
The color of the mineral in powder form
Luster
How the mineral reflects light
Density
How closely packed the mineral’s molecules are
Inorganic
Not made up of living things or of things that were ever living
Crystalline
A regular repeating structure
Cleavage
How the mineral splits along weak areas
Consistent chemical composition
Chemicals that make up the substance are the same all the way through
Igneous
Rock that forms when magma cools and hardens
Stratification
The layering of sedimentary rock
Cross Beds
Layers of rock characterized by slanting layers
Metamorphic
Rock that is formed due to pressure and heat
Minerals
Inorganic solids that have a characteristic chemical composition,
an orderly internal structure, and a characteristic set of physical
properties
Rocks
A mixture of both solid organic matter and mineral
Sedimentary
Rock composed of sediment that has been compressed or cemented
together and hardened
Intrusive Igneous
Igneous rock that forms when magma “intrudes” or enters into another
rock mass and then cools
Depositional Environment
What it was like in the area when the sediment settled or deposited
itself there
MORE INFO TO KNOW!!!
What are the three major types of rocks?
1._Igneous
2. _Sedimentary
3. _Metamorphic
Name FOUR ways to tell if a substance is a mineral
1. _Is inorganic
2. _Occurs naturally
3. _Has crystalline form
4. __Has a consistent chemical composition
What are the two main groups of minerals?
Silicates Non-Silicates