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3DD-9D8 Gypsum CaSO₄·2H₂O

Boulouparis, Southern Province, New Caledonia, France

Dimensions: 75 mm x 60 mm x 65 mm
Field of View: 9.9 cm
Largest Crystal Size: 30 mm
Weight: 184 g

Dim : 75x60x65mm.

Rose-like and petal-shaped crystals of gypsum, found in argilitic/clay (like smectite) weathered formations, named vertisol, close to maritime areas.
The weathered formations result from sulfide-bearing units, especially volcaniclastic deposits (Teremba Terrane or Eocene Flysh), basalts (Poya Terrane) and sometimes alluvium deposits.

Studies from Podwojewski (1994, 1995) about sulfur isotopic ratio and distance from the coast, showed that :
- Near the shore, sulfur mainly sourced from seawater (sea spume),
- Inland, sulfur mainly sourced from bedrock (disseminated sulfur).

Sources :
- Maurizot, P. and Mortimer, N. (eds) 2020. New Caledonia: Geology, Geodynamic Evolution and Mineral Resources. Geological Society, London, Memoirs, 51, 147–188, https://doi.org/10.1144/M51-2018-74
- Podwojewski, P. 1994. The origin of gypsum in vertisols in New Caledonia determined by the isotopic characteristics of sulphur.Geoderme, 63, 179–195, https://doi.org/10.1016/0016-7061(94)90062-0
- Podwojewski, P. 1995. The occurence and interpretation of carbonate and sulfate minerals in a sequence of vertisols in New Caledonia. Geoderma, 65, 223–248, https://doi.org/10.1016/0016-7061(94)00046-D

Copyright: © Lilian ALIZERT Photo ID: 1200107 Uploaded by: Lilian Alizert Upload date: 2022-02-27 View Count: 28 Status: Public galleries Type: Photo - 5474×3655 (20.0 Mpix)

General view to the south of the quarry

Pont-des-Francais Quarry, Le Mont-Dore, Southern Province, New Caledonia, France

Copyright: © Lilian ALIZERT Photo ID: 889272 Uploaded by: Lilian Alizert Upload date: 2018-05-08 View Count: 114 Status: Public galleries Type: Photo - 10733×3727 (40.0 Mpix)

View of effluents from the old Pilou mine

Pilou-Nemou Mine, Poum, Northern Province, New Caledonia, France

Possibly copper sulfates and hydroxides effluents

Copyright: © Lilian ALIZERT Photo ID: 888960 Uploaded by: Lilian Alizert Upload date: 2018-05-07 View Count: 192 Status: Public galleries Type: Photo - 3281×4374 (14.4 Mpix)

FXE-WLR Azurite Cu₃(CO₃)₂(OH)₂

Pilou-Nemou Mine, Poum, Northern Province, New Caledonia, France

Field of View: 1 mm

Copyright: © Lilian ALIZERT Photo ID: 888959 Uploaded by: Lilian Alizert Upload date: 2018-05-07 View Count: 91 Status: Public galleries Type: Photo - 2182×3408 (7.4 Mpix)

17A-L1W Asbolane (Ni,Co)_2-xMn⁴⁺(O,OH)₄·nH₂O , Limonite

Tiébaghi Mine, Tiébaghi Massif, Koumac, Northern Province, New Caledonia, France

Dimensions: 8 mm x 6 mm x 4 mm

Copyright: © Lilian ALIZERT Photo ID: 888955 Uploaded by: Lilian Alizert Upload date: 2018-05-07 View Count: 273 Status: Public galleries Type: Photo - 5641×3760 (21.2 Mpix)

Q9Y-HRE Laumontite CaAl₂Si₄O₁₂·4H₂O , Prehnite Ca₂Al₂Si₃O₁₀(OH)₂

Pont-des-Francais Quarry, Le Mont-Dore, Southern Province, New Caledonia, France

Dimensions: 50 mm x 30 mm x 30 mm
Field of View: 100 mm
Largest Crystal Size: 5 mm

Prismatic Laumontite crystals partially pseudomorphosed to Prehnite.

Copyright: © Lilian ALIZERT Photo ID: 746936 Uploaded by: Lilian Alizert Upload date: 2016-05-12 View Count: 88 Status: User gallery only Type: Photo - 2529×1090 (2.8 Mpix)