Rock facts
classification of igneous rocks
Minerals
common types of igneous rocks
Granite and Diorite
how are igneous rocks classified?
what is Obsidian texture feel like?
glassy.
Dikes and sills
Tabular(sheet-like) intrusions
Dike- vertical
sill- horizontal
What are Igneous rocks
formed when melted rock cools
uncommon types of igneous rocks
Gabbro and Peridotite
what are dark-colored minerals rich in?
iron and magnesium
what does scoria rocks feel like?
Pipes
cylindrical conduits ( holes that go up)
How Rocks melt
Intense heat and pressure cause the rock to melt.
Types of intrusive Igneous rocks
Gabbro
Peridotite
Granite
Diorite
what rocks have a higher percentage of dark minerals?
Basalt and Komatite
Definition of vesicular rocks?
pitted with many cavities at the surface and inside of the rocks
Laccoliths
like sills but cause over layings rocks to bulge upwards
What determines the composition of magma?
The composition of the original rock determine the composition of the magma
Rhyolite
Andesite
Basalt
Komatite
What is another word for iron and magnesium and combined
Ferromagnesian
what are some rocks that have the same texture as Scoria?
Rhyolite, Andesite, Pumice, and basalt.
stoping
magma that creeps upwards by fragmenting the overlying rocks
What is it called when minerals crystalize from magma when it cools
Bowen's reaction
Rarest type of Igneous rock
Komatiite
how to classify Igneous rocks if they don't have crystals?
colour and other textural features.
Rocks that have large crystals are called?
phaneritic textured
Xenoliths
foreign rocks