How is a rock like a salad?. Physical Properties of Minerals. Color Some minerals only occur as one c olor . However, some minerals, s uch as quartz can be many different colors. Hardness A measure of how easily a mineral can be scratched. Measured on a
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Some minerals only occur as one
color. However, some minerals,
such as quartz can be many
A measure of how easily a mineral
can be scratched. Measured on a
Scale from 1 (softest) to 10 (hardest).
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).
Describes the way a mineral
reflects light from it’s surface.
Either metallic or non-metallic.
When a mineral breaks to form one or more flat
surfaces it is said to have cleavage(e.g., mica).
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
Weathering & Erosion
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
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
Formed from cooled magma
Formed from eroded sediment
Formed by heat and pressure