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Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg,Fe) 3 AlSi 3 O 10 (F,OH) 2.It is primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous end-members include siderophyllite and eastonite.
Common micas: Biotite [16] Lepidolite; Phlogopite; Zinnwaldite; Brittle micas: ... the mica is a common mica, whereas if the X ion is Ca, the mica is classed as a ...
Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica. Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg 3 AlSi 3 O 10 (F,OH) 2. Iron substitutes for magnesium in variable amounts leading to the more common ...
[6] [7] A granite containing both muscovite and biotite micas is called a binary or two-mica granite. Two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites, as described below. [8] [9] Another aspect of granite classification is the ratios of metals that potentially form ...
The other common mica mineral, biotite, is almost always much darker in color than muscovite. Paragonite can be difficult to distinguish from muscovite but is much less common, though it is likely mistaken for muscovite often enough that it may be more common that is generally appreciated. [9] Muscovite mica from Brazil is red due to manganese ...
Common food products that can contain Red Dye No. 3 include: Sprinkles. Icing. Baking mixes. Cereals. Berry- and cherry-flavored candy. Strawberry milk. Peppermint candies. Soda. Fruit cocktail.
Annite is a member of the mica group and has very similar properties as other micas such as muscovite and biotite. More importantly, annite is interesting to geologists because it can be used for potassium-argon dating. Because annite contains large amounts of potassium, it can be used to find the absolute age of articles older than 1000 years.
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