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Mineralpedia Details for Decrespignyite-(Y)

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Decrespignyite-(Y)

Decrespignyite-(Y)

Named for Robert James Champion de Crespigny, the Chairman of Normandy Mining Limited and the Chairman of the South Australian Museum, for his large contributions to furthering Australian education. Decrespignyite is a rare mineral that can be found only in the Paratoo copper mine in South Australia, Australia. It occurs there as a secondary mineral in oxidized copper deposits with the source of the rare earth yttrium likely from the surrounding sediments.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/decrespignyite-(Y).pdf

Formula
Y4Cu(CO3)4Cl(OH)5ยท2H2
Crystal System
Monoclinic 
Crystal Habit
Efflorescences, Globular 
Cleavage
None, None, None 
Luster
Vitreous - Pearly 
Color
intense royal blue, turquoise blue 
Streak
pale blue 
Class
Monoclinic 
Hardness
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Decrespignyite-(y) from Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia

Decrespignyite-(y)
            from Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia

Sky blue, spherical clusters to about 0.75mm.

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