
1) Beautiful stone 2) Cut mineral 3) Dark-colored mica 4) Decorative stone 5) Gemstone 6) Gemstone mineral 7) Isinglass 8) Jewel mineral 9) Jewel 10) Magnesium mineral 11) Mica 12) Mineral of the mica group 13) Mineral jewel 14) Mineral gemstone 15) Potassium mineral 16) Polished jewel 17) Polished mineral
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1) Lepidomelane 2) Mica
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https://www.crosswordclues.com/clue/biotite

Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula {chem|K(Mg,Fe)|3|AlSi|3|O|10|(F,OH)|2}. More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers include siderophyll...
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http://en.wikipedia.org/wiki/Biotite

• (n.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.
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A dark brown to green, magnesium-iron mica commonly found in igneous and metamorphic rocks.
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a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and ... [8 related articles]
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http://www.britannica.com/eb/a-z/b/67

A dark, iron and magnesium-rich mica found in granite.
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http://www.encyclo.co.uk/local/22192
Bi'o·tite noun [ From
Biot , a French naturalist.]
(Min.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See
Mica .
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http://www.encyclo.co.uk/webster/B/54

Black mica. An important rock-forming ferromagnesian silicate with silicon-oxygen tetrahedra arranged in sheets.
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http://www.evcforum.net/WebPages/Glossary_Geology.html

Biotite, named after the naturalist Biot, is a widely distributed rock forming mineral and occurs in igneous and metamorphic rocks and is a common member of the mica group. It has the formulae K(Mg,Fe) 2(Al,Fe)Si3O10(OH, F) 2 and a relative hardness of 3.
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http://www.probertencyclopaedia.com/browse/HB.HTM

A dark-colored phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg,Fe)3AlSi3O10(F,OH)2.
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http://www.scientificpsychic.com/etc/geology-glossary.html

A black, brown, or dark-green mica, a magnesium iron silicate.
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[
n] - dark brown to black mica found in igneous and metamorphic rock
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http://www.webdictionary.co.uk/definition.php?query=biotite
noun dark brown to black mica found in igneous and metamorphic rock
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https://www.encyclo.co.uk/local/20974

A platy magnesium-iron mica, common in igneous rocks.
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https://www.encyclo.co.uk/local/22709

A platy magnesium-iron mica, common in igneous rocks.
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https://www.encyclo.co.uk/local/22733

A platy magnesium-iron mica, common in igneous rocks.
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https://www.encyclo.co.uk/local/22734
(Potassium Iron Magnesium Aluminum Silicate Hydroxide Fluoride) Biotite is a common rock forming mineral, being present in at least some percentage in most igneous and both regional and contact metamorphic rocks. The typical black to brown color of biotite is characteristic although it is difficult to distinguish brown biotite ...
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https://www.encyclo.co.uk/local/23719

a very common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks.
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https://www.infoplease.com/dictionary/biotite
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