0
Texture:
Aphanitic -- small crystals, invisible without magnification
Porphyritic -- visible crystals amid a fine-grained groundmass
Phaneritic -- large visible crystals
Composition:
Felsic -- more than 65% silica
Intermediate -- between 55-65% silica
Mafic -- between 45-55% silica
Ultramafic -- less than 45% silica
What else can I help you with?
Sedimentary rocks are named according to what?
according to composition i.e. mineral grains, fossils, animal/plant matter, chemical composition etc. and grain size (gravel, sand, silt, clay) for example sandstone is made up of mainly rock fragments or mineral grains (quartz, feldspar, clay) weathered form other rocks and has grains that are 1/16-2mm large.
How did Antoine Lavoisier say substances should be named?
Antoine Lavoisier proposed that substances should be named based on their elemental composition, meaning that they should be named using the elements they are composed of.
Can you give me a poem about igneous rocks?
There was a young fellow named Tim, Who had never learned how to swim, He fell off a Dock, Sunk like an igneous rock, And that was the end of him.
Intrusive igneous rock named after Roman god of underworld?
Plutonic rock, named after the Roman god of the underworld, Pluto, is granite.
How are gemstones named?
Gemstones are typically named based on their chemical composition, color, or sometimes based on the location where they are found. Some gemstones are named after the person who discovered or popularized them. Many gemstones have traditional names that have been used for centuries and are widely recognized in the industry.
Rocks are named according to what?
according to composition i.e. mineral grains, fossils, animal/plant matter, chemical composition etc. and grain size (gravel, sand, silt, clay) for example sandstone is made up of mainly rock fragments or mineral grains (quartz, feldspar, clay) weathered form other rocks and has grains that are 1/16-2mm large.
What is rhyolitic composition?
It contains about 70% Silica(SiO2)Added:Rhyolite, a gost town town in South-Nevada, is named for rhyolite, an igneous rock composed of light-colored silicates, usually buff to pink and occasionally light gray. It belongs to the same rock class, felsic, as granite but is much less common.
Sedimentary rocks are named according to what?
according to composition i.e. mineral grains, fossils, animal/plant matter, chemical composition etc. and grain size (gravel, sand, silt, clay) for example sandstone is made up of mainly rock fragments or mineral grains (quartz, feldspar, clay) weathered form other rocks and has grains that are 1/16-2mm large.
How did Antoine Lavoisier say substances should be named?
Antoine Lavoisier proposed that substances should be named based on their elemental composition, meaning that they should be named using the elements they are composed of.
What is the name of any body of igneous rock named for the Roman god of the underworld?
One example of a body of igneous rock named after the Roman god of the underworld is pluton. Plutons are large underground igneous rock formations that form from the solidification of magma beneath the Earth's surface.
Can you give me a poem about igneous rocks?
There was a young fellow named Tim, Who had never learned how to swim, He fell off a Dock, Sunk like an igneous rock, And that was the end of him.
Intrusive igneous rock named after Roman god of underworld?
Plutonic rock, named after the Roman god of the underworld, Pluto, is granite.
How are gemstones named?
Gemstones are typically named based on their chemical composition, color, or sometimes based on the location where they are found. Some gemstones are named after the person who discovered or popularized them. Many gemstones have traditional names that have been used for centuries and are widely recognized in the industry.
What is based on the the teachings of a man named mahavira?
was based on the teachings a man named Mahvira
Is the composition of a compound the same everywhere?
Yes: The characteristic named is part of the definition of a compound.
Which extrusive igneous rock was nick-named 'volcanic glass'?
Obsidian and Tachylite are extrusive felsic (high silica content > 69% SiO2) and mafic (low silica content < 52% SiO2) igneous rock types respectively. They are commonly known as volcanic glasses and form due to the rapid cooling of lava. This rapid cooling prevents mineral crystallisation from occurring and this accounts for their "glassy" (or more correctly their vitreous)A texture. A A vitreous material is an amorphous (i.e. non crystalline) solid material. Please see the related link.
What are all the rocks in the world?
All the named rocks are igneous, metamorphic, or sedimentary.
