optical properties of biotite

Biotite is a very common form of mica. Properties - In hand specimen, Biotite is brown to black and shows the perfect {001} micaceous cleavage. Peraluminous two-mica granitoid. Biotite mica is sometimes called "iron mica" because it is more iron-rich than phlogopite. Named in 1847 by Johann Friedrich Ludwig Hausmann in honour of the French physicist, mathematician, meteoriticist, astronomer, and mineralogist, Jean-Baptiste Biot [April 21, 1774, Paris, France - February 3, 1862, Paris, France], who studied the optical properties of the micas. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. Biotite actually belongs to the Silicates mineral class. The physical properties of biotite are affected by the amount of iron present. Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg, Fe) 3 AlSi 3 O 10 (F, OH) 2.The name “biotite” is used in the field and in entry-level geology courses because these minerals generally cannot be distinguished without optical, chemical, or x-ray analysis. OPTICAL PROPERTIES OF COMMON MINERALS. If you have any questions, comments or suggestions, please, send them via email.The blog is being moderated all the time. Its streak is white or gray, and it has a vitreous luster. Pronunciation . IMA Status: Not Approved IMA 1998 - Bitote is now the group name : Locality: Common world wide. Also, the tenacity of biotite is brittle to flexible. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties. In thin section, it shows the perfect cleavage and mottled extinction typical of all micas. Optical spectra of giant radiohaloes in Madagascan biotite. This common brown or black color of biotite is actually characteristic even though it’s hard to determine brown biotite from the dark brown phlogopite. Biotite is a sheet silicate; iron, magnesium, aluminium, silicon, oxygen, and hydrogen form sheets that are weakly bound together by potassium ions. Metaphysical Properties. Common biotite can show shades of brown yellow green and red. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties. Posted by Rukshan at 7:37 AM. Biotite was named by J.F.L. For Jean Baptiste Biot (1774-1862), French physicist, who studied the optical differences between the micas. The optical properties that can be seen under this arrangement are as follows, 1. Biotite was named by J.F.L. IPA : /ˈbaɪəˌtaɪt/ Noun . It was named in honor of Jean Baptiste Biot, a French physicist who discovered the optical properties of micas in the year 1816. Martin Frobenius Ledermüller's "Physicalische beobachtungen derer saamethiergens" (1756) by Allison Meier 2. It is also known as Black Mica. Ferro-hornblende Optical Properties. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties. You will find links to your left on general information, composition and chemical formula, optical properties, physical properties… Example of Interference Colors: Biotite, Quartz and Graphite in a Mica Schist Here we see mostly brown biotite flakes. In such circumstances, the host mineral may exsolve small crystals of the other mineral and a distinctive texture will result. Gneiss is a medium- to coarse-grained rock that can be found in a variety of locations, but its characteristic banding can perhaps best be seen in massive exposed samples, such as those at Stone Mountain, Georgia and Hickory Nut Gorge in North Carolina. The biotite show various shades of brown and tan in PP light (it is pleochroic).Biotite has moderately high birefringence. It has a vitreous to pearly lustre. Select one of the minerals listed below to get a summary of the optical data and view representative plane light and crossed polar images. Biot +‎ -ite, named by J.F.L. The discovery of new optical materials has been accompanied by a … Most people chose this as the best definition of biotite: A dark-brown or dark-gree... See the dictionary meaning, pronunciation, ... researched the optical properties of mica, discovering many unique properties… Link to MinDat.org Location Data. Changes in optical properties characterizing the weathering of biotite to vermiculite or smectite refer to the gradual discolouring to pale yellow, the The crystals are intergrown in such a way that certain structural elements are common to both and that parts of the crystal structure must pass unbroken through the contact between them. Airn, magnesium, aluminium, silicon, oxygen, an hydrogen furm sheets that are waikly boond thegither bi potassium ions. It's most characteristic property is its pleochroism, showing yellow to brown to green colors. A fragment from an erratic on Alnö Island, Sweden. Biotite and muscovite are the two most common mica minerals that often occur together in Al-rich igneous rock. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties. Accicular(needle shaped) silimanite Rounded grains of Garnet. Optic Colour ... Biotite - parallel cleavages Pyroxene - 90 degree cleavage sets 6. Biotite hand-specimen Formula: K(Mg,Fe) 3 (AlSi 3 O 10 )(F,OH) 2 Biotite is a series or subgroup of micas that typically contain Fe in the formula. The color of biotite in hand sample is brown to black (sometimes greenish). It is named in honor Jean Baptiste Biot (1774 - 1862), a French physicist, mathematician, and astronomer who researched the mica minerals for their optical properties. Moreover, its optical properties can vary from transparent to translucent to opaque. Name Origin: Named in 1847 after the French physicist, Jean Baptiste Biot (1774 - 1862), who studied the optical properties of the micas. It usually occurs in rust, golden brown, reddish brown, dark brown, and brown colors. Biotite is a mineral that’s named after French physicist Jean Baptist who studied and researched about it for its optical properties. 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