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What are the chemical compositions of the various types of Feldspar?
Wiki User
∙ 13y ago
Potassium feldspars are common members of the alkali feldspar group and form a complete solid solution series from KAaSi3O8 through (K, Na)AlSi3O8 to NaAlSi3O8. You really need more information for a precise chemical composition as K-Feldspars can have a wide range of chemical compositions.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoThere are broadly three main types of feldspars: calcium, sodium and potassium. They have the following general chemical formulas:
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
The endmember mineral states are known as K-Feldspar, Albite and Anorthite which are the potassium, sodium and calcium feldspars respectively.
Calcium and Sodium Rich Feldspars:
There can be a mix of calcium and sodium (more correctly termed solid solutions) in Feldspars between Albite and Anorthite which are known generally as Plagioclase feldspars.
Depending on the relative sodium and calcium contents they are given differing names:
Albite = 100 - 90 % Na, 0 - 10 % Ca
Oligoclase = 90 - 70 % Na, 10 - 30 % Ca
Andesine = 70 - 50 % Na, 30 - 50 % Ca
Labradorite = 50 - 30 % Na, 50 - 70 % Ca
Bytownite = 30 - 10 % Ns, 70 - 90 % Ca
Anorthite = 10 - 0 % Na, 90 - 100% Ca
Alkali Feldspars (containing Potassium and Sodium)
There is also a limited solid solution series between Albite and K-Feldspars which takes the following form which is further complicated by the temperature dependent stability of some of the mineral forms:
Albite = 100 - 90 % Na, 0 - 10 % K
Anorthoclase = 90 - 64 % Na, 10 - 36 % K
Sanadine: Contains varying amounts of Na. Stable at high temperature. Occurs in rapidly cooled rocks.
Orthoclase: Predominately K, minor amounts of Na. Stable at moderate temperatures.
Microcline: Predominately K, minor amounts of Na. Stable at lowest temperatures. Common in the most slowly cooled rock types such as granites and pegmatites.
The chemical formulas of the Plagioclase Feldspars are as follows:
Albite = NaAlSi3O8
Oligoclase = (Na,Ca)(Al,Si)AlSi2O8
Andesine = NaAlSi3O8 - CaAl2Si2O8
Labradorite = (Ca,Na)Al(Al,Si)Si2O8
Bytownite = (NaSi,CaAl)AlSi2O8
Anorthite = CaAl2Si2O8
The chemical formulas of the Alkali Feldspars are as follows:
Albite = NaAlSi3O8
Anorthoclase = ((Na,K)AlSi3O8)
Sanadine = (K,Na)(Si,Al)4O8
Orthoclase and Microcline = KAlSi3O8
Finally there are two types of Feldspars that contain Barium. These are known unsurprisingly as Barium Feldspars:
Celsian = BaAl2Si2O
Hyalophane = (K,Ba)[Al(Si,Al)Si2O8]
For more information, please see the related links.
Wiki User
∙ 13y agoFeldspars break down to form clays like kaolin.
Wiki User
∙ 13y ago1 atom of Potassium, 1 of Chlorine and 3 of Oxygen
Wiki User
∙ 11y agoThe chemical formula of kaolinite is Al2Si2O5(OH)4.
Wiki User
∙ 15y agoFelsic rocks are greater than 69% quartz.
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What are the types of feldspar?
There are broadly three main types of feldspars: calcium, sodium and potassium. They have the following general chemical formulas:KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8The endmember mineral states are known as K-Feldspar, Albite and Anorthite which are the potassium, sodium and calcium feldspars respectively.There can be a mix of calcium and sodium (more correctly termed solid solutions) in Feldspars between Albite and Anorthite which are known generally as Plagioclase feldspars.For more information please see the related question
Is feldspar a rock or mineral?
Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also occur as compact minerals, as veins, and are also present in many types of
What was feldspar used for?
Feldspars are a common non-metallic alumino-silicate mineral that have a hardness of 6 on Mohs scale and produce white streaks.There are broadly three main types: potassium, sodium and calcium rich feldspars. They have the following general chemical formulas:KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8The endmember mineral states are known as K-Feldspar, Albite and Anorthite which are the potassium, sodium and calcium feldspars respectively.Perhaps you mean feldspar?Feldspar is the most common rock mineral in the Earth's crust (about 60%).
What is the mineral composition of andesite?
basalt and dacite, and ranges from 57 to 63% silicon dioxide (SiO2)
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Chemical weathering often refers to the chemical reactions that take place between acidic rain or ground water and various rock types. It can also refer to the gradual oxidation of minerals by exposure to air and water. The chemical reaction usually results in the gradual dissolution of the rock.
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ionic bond covalent bond coordinate covalent bond
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Who discovered the Feldspar Rocks?
The person who first found feldspar rocks is unknown, however, these types of rocks are commonly found in the Earth's crust and along road cuts of Ontario. Feldspar is commonly found in granite.
What are the types of feldspar?
There are broadly three main types of feldspars: calcium, sodium and potassium. They have the following general chemical formulas:KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8The endmember mineral states are known as K-Feldspar, Albite and Anorthite which are the potassium, sodium and calcium feldspars respectively.There can be a mix of calcium and sodium (more correctly termed solid solutions) in Feldspars between Albite and Anorthite which are known generally as Plagioclase feldspars.For more information please see the related question
Is feldspar a rock or mineral?
Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also occur as compact minerals, as veins, and are also present in many types of
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There are two types:(i)Narrative and (ii)Descriptive compositions.
Which chemical pathway appears to be important both in some types of psychotic behavior and in the reinforcing properties of various drugs?
Mesolimbic Dopamine
What are the three main types of sedimentary rock?
The three main types of sedimentary rocks are clastic, chemical and biochemical. Clastic rocks are made of minerals and rocks including quartz, mica and feldspar. Chemical rocks are created when water precipitates from ground water, lakes or the ocean. Biochemical rocks can be found in the ocean. This sedimentary rock comes from plants or living organisms which helps to build tissue.
What was feldspar used for?
Feldspars are a common non-metallic alumino-silicate mineral that have a hardness of 6 on Mohs scale and produce white streaks.There are broadly three main types: potassium, sodium and calcium rich feldspars. They have the following general chemical formulas:KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8The endmember mineral states are known as K-Feldspar, Albite and Anorthite which are the potassium, sodium and calcium feldspars respectively.Perhaps you mean feldspar?Feldspar is the most common rock mineral in the Earth's crust (about 60%).
