Igneous Rocks
This mineral is colorless in plain light, with first order birefringence. It can display undulatory extinction.
What is quartz?
What is garnet?
A particle that has a size smaller than 2mm and larger than 0.0625mm.
What is sand?
Most minerals are too fine-grained to see with the naked eye.
What is aphanitic?
The type of rock formed from the solidification of magma or lava.
What is an igneous rock?
The intrusive synonym for a basalt.
What is a gabbro?
This metamorphic rock is banded or "striped".
What is foliated?
The sedimentary rock almost, if not entirely, composed of calcite.
What is limestone?
Larger crystals in a matrix made of small crystals, due to a mix of cooling rates.
What is porphyritic?
When magma cools and crystallizes on Earth's surface it is called this kind of rock.
a fine-grained igneous rock which has a granitic (felsic) composition.
What is a rhyolite?
This mineral has second order birefringence and belongs to the mica family.
What is muscovite?
This mineral found in sedimentary rocks is commonly green and spherical.
What is glauconite?
Equigranular texture in which crystals adopt a polygonal morphology with grain triple junctions of approximately 120 degrees.
What is granoblastic?
Rocks that contain voids left by gases that escape as lava solidifies are said to exhibit this texture.
What is vesicular?
This common igneous minerals belongs to the phosphate group.
What is apatite?
This mineral commonly displays a cross shape due to the presence of black inclusions of graphite.
What is andalusite?
A sedimentary rock composed of over 60% quartz, 20% lithic fragments, and 2-% feldspar.
What is a lithic subarkose?
A metamorphic texture in which platy or tabular minerals are aligned to produce a planar fabric.
What is lepidoblastic?
The mingling of two melts creating a different chemical composition.
Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)
What is epidote?
This mineral is the high pressure polymorph of SiO2.
What is coesite?
The sedimentary rock composed almost entirely of sand sized fossil debris.
What is coquina?
Like felty which is "consisting of random microlites or tiny needle/lath like crystals of which at least some properties are microscopically determinable".
What is pilotaxitic?
The process in which magma is differentiated by the cooling of crystals and the separation of melt.
What is crystal fractionation/fractional crystallization?