|Mineral class||Silicates : Cyclosilicate : Andalusite - Sillimanite - Kyanite group.|
|Habitus||Short prismatic crystals, commonly twinned, or massive grainy aggregates.|
|Cleavage||Distinct, fracture conchoidal.|
|Color||Usually gray, but nuances in brown and blue is also common. Often strongly pleochroic. Transparent to translucent.|
|Occurance||Formed in igneous and contact metamorphic rocks (for example gneiss).|
|Notes|| Easily mistaken for quartz. Distinguished from quartz
by heating in a flame. Cordierite is much easier made to glow than quartz.|
Fusible on thin edges in a flame.
|Locations|| A very common mineral in Sweden. It's a component in
manySwedish schists, especially in central Sweden. |
| To silicate index.
|| Mineral group index.
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