Textures
These 2 rocks are consider to have an aphanitic texture.
Basalt, Rhyolite
What does it mean when a rock is said to be intrusive?
Cooled magma within the Earth's crust
What determines if a rock is Mafic?
High in Magnesium and iron resulting in a dark color
This rock is used as an exfoliant
PUMICE!!!
These 3 rocks do not have vesicles
Diorite, gabbro, Granite,
These 3 types of rocks are said to have a Phaneritic texture.
Diorite, Gabbro, Granite
These 5 rocks are extrusive.
Basalt, Obsidion, pumice, Rhyolite, Scoria
Which 3 rocks are considered Mafic?
Basalt, Gabbro, and scoria
This rock is used in construction and jewelry
Rhyolite
These 2 rocks have few to no vesicles
Basalt, obsidion
These 3 rocks are said to have a volcanic glass texture.
Pumice, Obsidion, Scoria
What does it mean when a rock is extrusive
Cooled lava at the Earth's surface
What makes a rock felsic?
rich in feldspar and quartz
This rock was used for building ancient tools.
Obsidion
These 3 rocks have many vesicles
pumice, rhyolite, scoria
What happens to a rock in order to have a Phaneritic Texture?
Magma cools slowly deep within the crust allowing crystals to form
These 3 rocks are intrusive.
Diorite, Gabbro, Granite
Which 3 rocks are felsic?
Granite, pumice and, rhyolite
This rock is used as road fill and construction
Basalt
How does a vesicular texture arise?
Rapidly cooling of magma or lava allowing gas bubbles to get trapped
What happens to a rock to give it an Aphanitic Texture?
Rapid cooling of lava at the Earth's crust preventing crystals to form
What is the main visual difference between extrusive and intrusive rocks?
Extrusive are darker in color and intrusive are lighter in color
What makes a rock Andesite?
bonus which rocks are Andesite
Andesite is a fine-grained rock that forms when the magma erupts onto the surface and crystallizes quickly.
Diorite, Obsidion
These 2 rocks are typically used in construction.
Gabbro, Granite
What does it mean when a rock has vesicles?
having numerous small, gas-filled cavities (vesicles) formed when gas bubbles trapped in rapidly cooling lava or magma solidify