| Property | Value |
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| rdf:type | |
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| rdfs:comment | - 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: (Mg,Fe)2Al3(Si5AlO18) to (Fe,Mg)2Al3(Si5AlO18). A high temperature polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (Si,Al)6O18 rings.
- Cordierite.jpg|thumb|300px|right]] Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. Iron is almost always present. Cordierite typically occurs in contact or regional metamorphism of argillaceous rocks. It is especially common in hornfels produced by contact metamorphism of pelitic rocks
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| owl:sameAs | |
| dcterms:subject | |
| dbkwik:ceramica/property/wikiPageUsesTemplate | |
| Category | |
| opticalprop | - Usually optically , sometimes ; 2V = 0-90°
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| diaphaniety | - Transparent to translucent
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| mohs | |
| Gravity | |
| Name | |
| symmetry | |
| Caption | |
| dana | |
| diagnostic | - Resembles quartz can be distinguished by pleochroism. Can be distinguished from corundum by its lower hardness
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| streak | |
| formula | |
| System | - Orthorhombic - Dipyramidal Space Group: C ccm
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| pleochroism | - X = pale yellow, green; Y = violet, blue-violet; Z = pale blue
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| strunz | |
| Color | - Blue, smoky blue, bluish violet; greenish, yellowish brown, gray; colorless to very pale blue in thin section
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| fusibility | |
| unit cell | - a = 17.079 Å, b = 9.730 Å, c = 9.356 Å; Z = 4
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| tenacity | |
| cleavage | - Fair on {100}, poor on {001} and {010}
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| habit | - Pseudo-hexagonal prismatic twins, as imbedded grains, and massive
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| twinning | - Common on {110}, {130}, simple, lamellar, cyclical
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| fracture | |
| refractive | - nα = 1.527 - 1.560 nβ = 1.532 - 1.574 nγ = 1.538 - 1.578 Indices increase with Fe content.
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| luster | |
| abstract | - 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: (Mg,Fe)2Al3(Si5AlO18) to (Fe,Mg)2Al3(Si5AlO18). A high temperature polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (Si,Al)6O18 rings.
- Cordierite.jpg|thumb|300px|right]] Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. Iron is almost always present. Cordierite typically occurs in contact or regional metamorphism of argillaceous rocks. It is especially common in hornfels produced by contact metamorphism of pelitic rocks
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