Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg,Fe)3AlSi3O10(F,OH)2. It is primarily...

somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende) peppering the lighter color minerals...

Garnet-biotite geothermometry is a method used to evaluate the peak temperature at which metamorphic rocks have formed. Geothermometry makes up one component...

minor amounts of muscovite mica as the lighter colored mineral components. Biotite and amphiboles often in the form of hornblende are more abundant in granodiorite...

also be named after a characteristic component such as garnet gneiss, biotite gneiss, albite gneiss, and so forth. Orthogneiss designates a gneiss derived...

only one cleavage plane. Talc has basal cleavage. Mica (like muscovite or biotite) also has basal cleavage; this is why mica can be peeled into thin sheets...

known as magnesium mica. Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg3AlSi3O10(F,OH)2. Iron...

igneous rocks which have primary mineralogy consisting of amphibole or biotite, and with feldspar in the groundmass. Lamprophyres are not amenable to...

Other minerals common in minor amounts include sodium-rich pyroxene, biotite, titanite, iron oxides, apatite, fluorite, melanite garnet, and zircon...

effect. Vermiculite forms by the weathering or hydrothermal alteration of biotite or phlogopite. Large commercial vermiculite mines exist in the United States...

Clays, sedimentary slates and shales yield biotite hornfels in which the most conspicuous mineral is biotite mica, the small scales of which are transparent...

along the Vigo–Régua shear zone, the monzogranites belong to the syn-F3 biotite granitoid group. They include large crystals of potassium feldspar and...

diorite gneiss. Rock types include gneissic biotite-quartz diorite, hornblende-biotite-quartz diorite, and biotite granodiorite, with minor amounts of quartz...

(Felsic minerals) High Olivine Plagioclase (Calcium rich) Pyroxene Amphibole Biotite (Black Mica) Plagioclase (Sodium rich) Relative Crystallization Temperature...

plagioclase ± epidote, garnet, cummingtonite, diopside, biotite In metapelites: muscovite + biotite + quartz + plagioclase ± garnet, staurolite, kyanite/sillimanite...

Formation consists chiefly of biotite-quartz phyllite and chlorite-biotite phyllite intercalated with minor amounts of biotite-sericite-quartz schist. Between...

brittle mica. Muscovite Paragonite Brittle micas: Margarite Common micas: Biotite Lepidolite Phlogopite Zinnwaldite Brittle micas: Clintonite Very fine-grained...

hornblende/actinolite +/- albite +/- biotite +/- quartz +/- garnet (calcite +/- wollastonite) Pelite; quartz, orthoclase +/- albite, +/- biotite +/- actinolite +/- garnet...

fallback – An ultramafic rock, essentially a peridotite Monzogranite – Biotite granite rocks that are considered to be the final fractionation product...

Mg4Si6O15(OH)2·6H2O Palygorskite (or attapulgite) – (Mg,Al)2Si4O10(OH)·4(H2O) Mica group Biotite – K(Mg,Fe)3(AlSi3)O10(OH)2 Fuchsite – K(Al,Cr)2(AlSi3)O10(OH)2 Muscovite...

types of mineral inclusions are typically surrounded "lily-pad" cleavages. Biotite flakes appear flat, brown, translucent, and tabular. Peridot has been prized...

spherical shell of discolouration (pleochroism) within minerals such as biotite that occurs in granite and other igneous rocks. The halo is a zone of radiation...

found in association with quartz, potassium feldspar, albite, muscovite, biotite, and tourmaline. Beryl is sometimes found in metasomatic contacts of igneous...

systems can release inorganic nutrients from minerals such as apatite or biotite and transfer these nutrients to the trees, thus contributing to tree nutrition...

Reddish crystals: biotite....

mafic minerals, when present, are magnetite and an iron-rich variety of biotite (lepidomelane). The rock was named after its occurrence at Litchfield,...

constituent minerals will be included in the rock name, such as quartz-felspar-biotite schist. Schist bedrock can pose a challenge for civil engineering because...

Cristobalite and trydimite are sometimes present along with the quartz. Biotite, augite, fayalite, and hornblende are common accessory minerals. Due to...

Micas Aluminoceladonite Anandite Annite Aspidolite Balestraite Bityite Biotite Boromuscovite Bramallite Celadonite Chernykhite Chromphyllite Clintonite...

40 Ar that has accumulated. The minerals best suited for dating include biotite, muscovite, metamorphic hornblende, and volcanic feldspar; whole rock samples...