{{Infobox mineral | name = Cordierite | category = | boxwidth = | boxbgcolor = | image = Cordierite.jpg | caption = Left: rough specimen showing dichroism; right: cut stone | formula = (Mg,Fe)₂Al₄Si₅O₁₈ | color = Blue, violet, yellow-brown; transparent to translucent | habit = Pseudo-hexagonal prismatic twins, as imbedded grains, and massive | system = Orthorhombic; 2/m 2/m 2/m | twinning = | cleavage = {010} poor | fracture = Conchoidal, uneven | mohs = 7 - 7.5 | luster = Greasy or vitreous | refractive = α=1.522 - 1.558 β=1.524 - 1.574 γ=1.527 - 1.578 Indices increase with Fe content. | opticalprop = Usually optically (-), sometimes (+); 2V = 0-90° | pleochroism = Strong, dichroic: brown-yellow, light and dark blue | streak = White | gravity = 2.57 - 2.66 | melt = | fusibility = on thin edges | diagnostic = Resembles quartz can be distinguished by pleochroism. Can be distinguished from corundum by its lower hardness | solubility = | other = Dana class: 61.2.1.1 }}

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