Rocks and Minerals Rocks and Minerals Fourth Grade Fourth Grade.
Minerals and rocks
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Transcript of Minerals and rocks
What are minerals and rocks?
- Rock is natural, solid, nonliving material made of one or more minerals.
- Mineral is natural, nonliving material that makes up rock.
Minerals and rocks
rocks get their properties from the minerals they contain.
The properties of rocks include color and texture.
Grains are bits of minerals. They are big enough to see them.
Texture is the size and pattern of a rock`s grains.
quartz
granite
Get properties from Minerals they
contain
each has its own
properties
Natural, nonliving material
Rocks Minerals
Identifying Minerals
property
1
Color is a property of a mineral that is easy to see. But some minerals can be found in different colors. Quartz pink purple yellow
brown white black
The mineral magnetite has the property of magnetism. Objects that contain iron are pulled to the magnetite.
Color
2
Another way to identify a mineral is by the color in its power form.
When you rub a mineral across a rough surface, it may leave a
streak mark or powder.
luster
3
Luster is a property that describes how a mineral reflects light. Minerals pearly silky
greasy glassy
dull metallic
Testing hardness
4
Talc is a mineral that is so soft you can scratch it with your fingernail.
The hardest mineral is diamond.
Sulfur is slightly harder than talc. But you can scratch it with your fingernail.
cleavage
5
cleavage is how minerals break apart along weak.
Some minerals break in one direction.
Other minerals break in two or more directions. Mica breaks in one direction. Diamonds break in four directions
Mica
Igneous rock
Melted rock sometimes forms beneath Earth`s surface.
Igneous rock forms when melted rock cools slowly below ground. Then the mineral grains in the igneous rock may be large. The melted rock comes to the surface and cools quickly. Then
the grains may be too small to see.
Igneous rock can come from volcanoes.
Igneous rock
Sedimentary rock
Sedimentary rock is the rock that forms from sediments.Sediments are tiny bits of rock, shells, and other materials.
Sediments settle to the bottom
Rivers
lakes
oceans
Over millions of years, the sediments are pressed together and cemented to form new rock.
Sedimentary rocks form in layers-one layer at a time.
Metamorphic rock
Metamorphic rock is rock that has been changed by heat and pressure.
Shale is a sedimentary rock. Heat and pressure underground change the minerals in the shale. The shale becomes a metamorphic rock. slate
Metamorphic rock
Shale slate
Granite is an igneous rock. It can be changed into , a metamorphic rock.
gneiss