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CaAl2Si2O8 (An)- NaAlSi3O8 (Ab)
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Which is the dominant feldspar in basalt?
Plagioclase
Would quartz or plagioclase be more likely to form a well shaped crystal in an igneous rock?
A well-shaped crystal in an igneous rock needs room and time to grow. So, minerals with high melting points form well shaped crystals while ones with lower melting points don't because there isn't as much time for them to form. Quartz crystallizes at a lower temperature than plagioclase so plagioclase is more likely to form well-shaped crystals.
Who discovered plagioclase?
Norman L. Bowen discovered the crystallization sequence that produced most of the rock-producing minerals. Known as the Bowen Reaction Series, he was the first to reproduce plagioclase.
What physical properties distinguish plagioclase feldspars from orthoclase feldspars?
One physical property that distinguishes plagioclase feldspars from orthoclase feldspars is their cleavage. Plagioclase feldspars typically exhibit good cleavage in two directions at right angles, while orthoclase feldspars show perfect cleavage in one direction. Another distinguishing feature is their color. Plagioclase feldspars are usually white to gray, while orthoclase feldspars can be white, pink, or other colors.
Name two rocks from the intermediate family?
plagioclase feldspar & hornblende
Would quartz or plagioclase be more likely to form well-shaped crystal in an igneous rock?
Plagioclase.
Is plagioclase composed of a single element?
No. The chemical formula of Plagioclase feldspar is (Na,Ca)(Si,Al)4O8
What minerals are in bojite?
Plagioclase and Hornblende
Which is the dominant feldspar in basalt?
Plagioclase
What type of rock is a plagioclase?
Plagioclase is not actually a rock, but a member of the feldspar family of minerals, and a major rock forming silicate mineral.
Is plagioclase a mineral?
Yes. I even have a specimen of it.
What minerals are used to make porcelain?
Plagioclase
What is plagioclase feldspar with quartz and olivine?
Diorite
What is an example of a mineral in the triclinic crystal system?
plagioclase, microcline, rhodonite, turquoise, wollastonite, amblygonite, and many more.
How can someone identify quartz in an igneous rock from plagioclase?
quartz will have conchidal fracture...plagioclase will have 2 sets of cleavage near 90 degrees and some striations quartz will have conchidal fracture...plagioclase will have 2 sets of cleavage near 90 degrees and some striations
What is pumice composition?
quartz, plagioclase and alkali feldspars
Would quartz or plagioclase be more likely to form a well shaped crystal in an igneous rock?
A well-shaped crystal in an igneous rock needs room and time to grow. So, minerals with high melting points form well shaped crystals while ones with lower melting points don't because there isn't as much time for them to form. Quartz crystallizes at a lower temperature than plagioclase so plagioclase is more likely to form well-shaped crystals.
