cordierite

[n] - a blue mineral of magnesium and iron and aluminum and silicon and oxygen
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Cordierite

Cor'di·er·ite (kôr'dĭ*ẽr*īt) noun [ Named after the geologist Cordier .] (Min.) See Iolite .
Found on http://www.encyclo.co.uk/webster/C/159

cordierite

noun a blue mineral of magnesium and iron and aluminum and silicon and oxygen; often used as a gemstone
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Cordierite

• (n.) See Iolite.
Found on http://thinkexist.com/dictionary/meaning/cordierite/

cordierite

blue silicate mineral that occurs as crystals or grains in igneous rocks. It typically occurs in thermally altered clay-rich sediments surrounding ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/c/141

Cordierite

Cordierite is found as an accessory mineral in granite, gneiss, schists, and in contact metamorphic zones. Transparent specimens of good colour have been used as a gem stone. It has the formulae Mg2Al4Si5O18 and a relative hardness of 8.
Found on http://www.probertencyclopaedia.com/browse/HC.HTM

Cordierite

Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. Iron is almost always present and a solid solution exists between Mg-rich cordierite and Fe-rich sekaninaite with a series formula: ({Magnesium},{Iron})2{Aluminium|3}({Silicon|5}{Aluminium}{Oxygen|18}) to ({Iron},{Magnesium})2{Aluminium|3}({Silicon|5}{Alumini...
Found on http://en.wikipedia.org/wiki/Cordierite

Cordierite

A silicate of magnesium and aluminum, Mg2Al3(AlSi5O18), found as an accessory mineral in granite, gneiss (cordierite gneiss), schists, and in contact metamorphic zones.
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