Transcript How is a rock like a salad? - GK-12

How is a rock like a salad?
Physical Properties of Minerals
Color
Hardness
A measure of how easily a mineral
can be scratched. Measured on a
Scale from 1 (softest) to 10 (hardest).
Some minerals only occur as one
color. However, some minerals,
such as quartz can be many
different colors.
Streak
Luster
Describes the way a mineral
reflects light from it’s surface.
Either metallic or non-metallic.
The color of powdered mineral.
Mineral is scraped across a
ceramic plate to create powder.
Streak and color are NOT always
the same (e.g., pyrite).
Cleavage
When a mineral breaks to form one or more flat
surfaces it is said to have cleavage(e.g., mica).
Color
Luster – metallic or non-metallic
A.
Pyrite
Streak – the color of powdered rock
Mineral Identification
Mineral A
Mineral B
Mineral C
Color:
Color:
Color:
Lustre:
Lustre:
Lustre:
Streak:
Streak:
Streak:
Answer
Answer
Answer
The Rock Cycle: Rock Types and Processes
Weathering & Erosion
IGNEOUS ROCK
Formed when magma cools
Intrusive – magma that cools VERY slowly
usually deep in the earths crust
Extrusive – magma that cools VERY quickly
usually ejected from volcanoes
Melting
SEDIMENTARY ROCK
Formed from pieces of solid materials
that have been deposited on Earth’s
surface. The solid pieces start out
as loose grains (e.g., sand) and are known
as sediment but become cemented
together to form solid rock
Burial
METAMORPHIC ROCK
Formed when rock is exposed to tremendous heat and
pressure. The rock is often deformed and the original
mineral crystals and/or grains recrystallize to form NEW
minerals
Igneous Rocks
Formed from cooled magma
Sedimentary Rocks
Formed from eroded sediment
Metamorphic Rocks
Formed by heat and pressure