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Dora Maira Massif, Cuneo Province, Piedmont, Italy
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Ellenbergerite
Dora Maira Massif, Cuneo Province, Piedmont, Italy

Photo: Elmar Lackner
 
Name(s) in local language(s): Massiccio Dora Maira, Cuneo, Piemonte, Italia
 
Very high pressure metamorphism of Mg-rich pelites, at depths over 100 km, have created this very unusual pyrope-coesite-quartzite, now exposed in the Western Alps. Famous for its (nearly) colorless, very pure pyrope (over 95% pyrope molecule) as crude crystals up to coconut size. High-pressure phases like ellenbergerite and coesite are preserved only as inclusions in the pyrope, not in the surrounding matrix.

The main composition of the quartzite is: quartz, phengite, talc, kyanite, pyrope.

Mineral List

Aluminoceladonite
'Apatite'
Bearthite
Clinochlore
Coesite
Corundum
Dravite
Ellenbergerite
Gedrite
Hydroxylwagnerite (TL)
Kyanite
Magnesiochloritoid
Magnesiodumortierite
'Monazite'
'Phengite'
Phosphoellenbergerite (TL)
Pyrope
Quartz
Rutile
Sapphirine
Talc
Vermiculite
Wagnerite
Zircon


24 entries listed. 21 valid minerals. 2 type localities (valid minerals).

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References

- Hermann, J. (2003) Experimental evidence for diamond-facies metamorphism in the Dora-Maira massif. Lithos 70: 163-182.

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