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What physical properties distinguish plagioclase feldspars from orthoclase feldspars?
Wiki User
∙ 11y ago
Tiffany.
Wiki User
∙ 11y ago
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.
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Is monzonite a diamond?
No. A diamond is a diamond, formed of carbon. One type of monzonite is [quartz] monzonite, formed of "approximately equal proportion of orthoclase and plagioclase feldspars." You can read more about monzonite -- the quartz version -- below. You can also read more about monzonite, below.
What is the luster of orthoclase?
Depending on the variety, feldspars can range from adamantine to glassy in luster.
What is the chemical composition for pink granite?
Pink granite would consist primarily of potassium feldspar and quartz with minor amounts of mica and other feldspars.
Is orthoclase a rock or a mineral?
Orthoclase feldspar is a tectosilicate mineral which is most commonly found in igneous rock. It has a Mohs hardness of 6 and has two cleavage planes which occur at right angles to each other. It is the potassium endmember of the feldspar group of minerals and is also referred to as alkali feldspar or K-spar. Orthoclase will appear in colors from white to deep pink, but has a white streak.
What minerals are common in both felsic and marfic igneous rocks?
Biotite and muscovite micas, quartz, magnetite, olivine, amphiboles, and feldspars.
What is pumice composition?
quartz, plagioclase and alkali feldspars
What are two feldspars found in granite?
Granite contains plagioclase feldspar and potassium feldspar. It really depends on the composition of the magma from which it forms. If the granite has a lot of pink in it, chances are it is potassium feldspar (K-Spar). If it is dominated by white, then the feldspar is probably plag.
Is monzonite a diamond?
No. A diamond is a diamond, formed of carbon. One type of monzonite is [quartz] monzonite, formed of "approximately equal proportion of orthoclase and plagioclase feldspars." You can read more about monzonite -- the quartz version -- below. You can also read more about monzonite, below.
How many different minerals can you find and identify in each rack?
It all depends on your sample. But the common Earth form forming minerals are Feldspars( Plagioclase and Orthoclase) Pyroxene Amphibole Quartz Micas (biotite and Muscovite) Olivine Pyrite Chalcopyrite Magmatite Hematite Gypsum Talc
Plagioclase feldspars contain significant variable percentages of what two elements?
potassium, calcium sodium
What is the hardness of basalt rock?
Plagioclase feldspars which are a component of basalt has a hardness of around 7 on the Mohs Scale.
Is the change from feldspar to clay minerals an example of chemical weathering?
It depends on the type of feldspar you're wondering about. I'm only 100% sure on one K-spar (Orthoclase) and one end-member of Plagioclase. Orthoclase (and probably the other K-feldspars as well - Microcline and Sanidine) weather to Illite, the most stable of the clay minerals: Orthoclase + CO2 + H2O ---> Illite + [K+ + HCO3- + SiO2]aq Albite (the Na-end-member of the plagioclase solid solution (Anorthite is the Ca-end-member, which may well weather in the same manner) weathers to Kaolinite: Albite + CO2 + H2O ---> Kaolinite + [Na+ + HCO3- + SiO2]aq
What is the luster of orthoclase?
Depending on the variety, feldspars can range from adamantine to glassy in luster.
Which minerals crystallize early in Bowen's reaction series?
Amphibole, plagioclase feldspars, olivine, pyroxene, and biotite mica have the highest crystallization temperatures.
What is sodium silicate?
Sodium aluminum silicate is part of a group of minerals known as plagioclase feldspars. Specifically albite and has the chemical formula NaAlSi3O8.
What is Sodium aluminum silicate?
Sodium aluminum silicate is part of a group of minerals known as plagioclase feldspars. Specifically albite and has the chemical formula NaAlSi3O8.
What are the main materials that felsic lava are made of?
Common rock-forming mafic minerals include olivine, pyroxene,amphibole, biotite mica, and the plagioclase feldspars
