Mineralpedia Details for 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)5ยท2H2O
- 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
- 4
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Decrespignyite-(y) from Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia
Sky blue, spherical clusters to about 0.75mm.
Click thumbnail images for larger view.
