Specializing in natural crystals for 25 years, to collectors and the metaphysical community. It is a name used for a large group of black mica minerals which include annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, eastonite, and many others. These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties. Biotite is a common rock forming mineral found in abundance in both igneous and metamorphic rock. Black Biotite is a powerful grounding stone. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. Biotite is sometimes used in decorative concrete as a surface treatment. She has taught science courses at the high school, college, and graduate levels. Stacks of sheets form what are called "books" because of their resemblance to pages. A generalized chemical composition for the biotite group is: 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. Learn more about quartz in this article. When biotite crystals are found in large chunks, they are called A similar nepheline-syenite is known from Hastings County, Ontario, and contains hardly any orthoclase, but only albite feldspar. However, hornblende is the most abundant mineral in a rock known as amphibolite which has a large number of uses. Minor impurities such as lithium, sodium, potassium, and titanium may be present. Biotite is often mistaken for gold by inexperienced gold panners. The primary use of biotite is to date the minimum age of rocks and geological features. First-time panners quickly learn to do some testing before shouting "gold" - which probably isn't a good idea even when gold is found because it can attract unwanted visitors to your panning spot. Ground mica is used as a filler and extender in paints, as an additive to drilling muds, as an inert filler and mold-release agent in rubber products, and as a non-stick surface coating on asphalt shingles and rolled roofing. Uses of Hornblende. All forms of mica, including biotite, may be ground and mixed. Uses of Biotite. Uses include electrical devices, such as, capacitors and thermionic valves. When biotite is separated into thin sheets, Biotite forms sheets of iron, silicon, magnesium, aluminum, and hydrogen weakly bonded by potassium ions. Specimen is approximately 4 inches (10 centimeters) across. When heated, the vermiculite will expand to most of its initial volume at an accordion-like expansion of its layered structure. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot who, in 1816, researched the optical properties of mica, discovering many unique properties. When sunlight strikes small flakes of Biotite in a gold pan, it produces a brilliant bronze-colored reflection that looks very much like gold. Uses. granite and rhyolite ), and metamorphic rocks (e.g. Biotite, cancrinite and sodalite are characteristic of this rock. Biotite is used readily to determine ages of rocks by either potassium … and treated samples, and there are many steps in the process where things may go wrong … »More detailed. Alibaba.com offers 809 biotite mica uses products. Biotite is a rock-forming mineral found in a wide range of crystalline igneous rocks such as granite, diorite, gabbro, peridotite, and pegmatite. In ground form, it can be used as an extender or filler in paints and as an inert filler in rubber products. Biotite is a dark-colored mica. Description: This sample of granite comes from Luxulyan, St Austell, Cornwall. It is an aluminosilicate mineral that forms sheets or flakes. The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. A small list of the biotite minerals is given below with their chemical compositions. A diluted solution ( 1 Tbsp/gallon ) on vegetables prepare Abhraka bhasma for the treatment of digestive and respiratory.... More aluminous end-members include siderophyllite and eastonite has a white and black speckled.. Only mafic mineral in what is biotite used for rock and see glittery flashes, there 's a soft mineral calculated... Localities biotite is often mistaken for gold by inexperienced gold panners iron, silicon, magnesium aluminum! 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