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cordierite

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cordierite

Silicate mineral, (Mg,Fe)2Al4Si5O18, blue to purplish in colour. It is characteristic of metamorphic rocks formed from clay sediments under conditions of low pressure but moderate temperature; it is the mineral that forms the spots in spotted slate and spotted hornfels.



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From 2009 onward, the joint venture partners plan to manufacture high performance and cost-effective diesel particulate filters made of cordierite and to market them separately.
The metamorphosed alteration zones are characterized by the presence of various combinations of anthophyllite, cordierite, garnet, staurolite, biotite and/ or andalusite.
The high magnesium content suggests it came from deeper than about 16 miles, Marvin says, while the cordierite means it was probably no more than 30 miles deep.
 
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