College of Engineering
Department of Materials Science
and Engineering
Rock Cycle
Microscopy
Vijaya K Rangari,Ph.D
Email: rangariv@mytu.tuskegee.edu
Ph.334 724 4875
Materials Science and Engineering
Tuskegee University
How do you see small object ?
Why NANO now
How do you see NANO ?
Electron microscopes
Atomic force Microscopy
Igneous Rock (Basalt)
• Rocks formed by the cooling and
solidifying of molten materials.
• Igneous rocks can form beneath
the Earth's surface, or at its.
surface, as lava.
• Basalt is a dark-colored, finegrained, igneous rock.
• It most commonly forms as an
extrusive rock, such as a lava flow.
• Earth's Most Abundant Bedrock.
Igneous Rock
Basalt
Sedimentary Rock (Bituminus Coal)
• Coal is an organic sedimentary rock
that forms from the accumulation
and preservation of plant materials,
usually in a swamp environment.
• Formed when sand, mud and
pebbles at the bottom of the rivers,
lakes and oceans pile up
• Sedimentary rocks are produced by
the weathering of pre-existing
rocks and the subsequent
transportation and deposition of
the weathering products.
• The sediment is compressed over a
long period of time before
consolidating into solid layers of
rock
Sedimentary Rock
Bituminus Coal
Metamorphic Rock(Slate)
Metamorphic rocks that are changed from
their original (sedimentary and igneous
rocks) form due to changes in temperature,
pressure or chemical alteration.
Metamorphic rock
Slate is a fine-grained, foliated metamorphic
rock that is created by the alteration of shale
or mudstone by low-grade regional
metamorphism.
Slate
Most slates are gray in color and range in a
continuum of shades from light to dark
gray. Slate also occurs in shades of green,
red, black, purple and brown.
Activity on Microscopy of Rocks
We will provide three types of rocks
a.
Sedimentary = pressure and compaction
b.
Igneous = heat (volcanoes)
c.
Metamorphic = heat and pressure (regional)
Look at the given three different rock samples:
1. With a hand held lens (magnifying glass) and
2. With a microscope
Look for the rock with the most different
Shapes
Size
Color
Edges
Select one type of rock and describe its color, shape, size and anything else you see
different from others. Make an assumption about the rock where it come from ?
Thanks for your attention
Questions
and
Comments