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Forêtite

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About ForêtiteHide

Formula:
Cu2Al2(AsO4)(OH,O,H2O)6
Colour:
Pale blue
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.286 (Calculated)
Crystal System:
Triclinic
Name:
The mineral is named in honour of Dr Jean-Paul Forêt (b. 1943), retired engineer of the French Ministry of Equipment, who worked as geologist-in-charge of major risks and the environment. He was a co-founder of the project which turned the Cap Garonne mine into a nationally protected site and museum in 1994 (Musée de la Mine de Cap Garonne), and has acted as a scientific advisor to the museum from then until now.
Pale blue microcrystalline mineral forming tiny globules and thin crusts.

Originally described as an "Unnamed (Cu-Al Arsenate)" (Chiappero, 1993), then approved in 2012 using new material (Mills et al., 2012).

Visually similar to pale blue (Cu-bearing) crandallite-group minerals.



Classification of ForêtiteHide

Approved
Approval Year:
2012

Physical Properties of ForêtiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale blue
Hardness:
3 - 4 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Density:
3.286 g/cm3 (Calculated)

Optical Data of ForêtiteHide

Type:
Biaxial

Chemical Properties of ForêtiteHide

Formula:
Cu2Al2(AsO4)(OH,O,H2O)6
IMA Formula:
Cu2Al2(AsO4)(OH,O,H2O)6

Crystallography of ForêtiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.969(9) Å, b = 7.676(9) Å, c = 8.591(11) Å
α = 82.01(9)°, β = 71.68(8)°, γ = 102.68(8)°
Ratio:
a:b:c = 0.908 : 1 : 1.119
Unit Cell V:
414.76 ų (Calculated from Unit Cell)
Comment:
New structure type

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.307(100)
4.519(23)
4.277(18)
3.455(17)
3.141(24)
2.818(24)
2.719(20)
2.343(22)

Type Occurrence of ForêtiteHide

Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, USA, catalogue numbers 63573, 63574, 63575, 63576 and 63577
Museum Victoria, Melbourne, Australia, registration number M51746
Muséum National d’Histoire Naturelle, Paris, France, catalogue 211.5

Synonyms of ForêtiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Mansfieldite-Scorodite Series8 photos of Forêtite associated with Mansfieldite-Scorodite Series on mindat.org.
Cyanotrichite2 photos of Forêtite associated with Cyanotrichite on mindat.org.
Parnauite2 photos of Forêtite associated with Parnauite on mindat.org.
Olivenite1 photo of Forêtite associated with Olivenite on mindat.org.
Bariopharmacoalumite1 photo of Forêtite associated with Bariopharmacoalumite on mindat.org.
Chalcophyllite1 photo of Forêtite associated with Chalcophyllite on mindat.org.
Mansfieldite1 photo of Forêtite associated with Mansfieldite on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ForêtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chiappero, P.-J. (1993): Les arséniates de cuivre naturels: Systématique et approche des conditions de genèse par les synthèses. Applications au gisement plumbocuprifère de Cap Garonne (Var, France). - Thèse de Doctorat, Université d'Orléans, 293 pp. [phase "X2", pp. 141-144]
Kolitsch (unpubl. data, 2009)
Mills, S.J., Kampf, A.R., McDonald, A.M., Favreau, G., Chiappero, P.-J. (2012) Forêtite, IMA 2011-100. CNMNC Newsletter No. 13, June 2012, page 809; Mineralogical Magazine, 76, 807-817.
Mills, S.J., Kampf, A.R., McDonald, A.M., Favreau, G., Chiappero, P.-J. (2012) Forêtite, a new secondary arsenate mineral from the Cap Garonne mine, France. Mineralogical Magazine, 76, 769-777.

Internet Links for ForêtiteHide

Localities for ForêtiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Occitanie
    • Aude
      • Salsigne
Mills, S.J., Kampf, A.R., McDonald, A.M., Favreau, G., Chiappero, P.-J. (2012) Forêtite, a new secondary arsenate mineral from the Cap Garonne mine, France. Mineralogical Magazine, 76, 769-777.
  • Provence-Alpes-Côte d'Azur
    • Var
      • Le Pradet
Chiappero, P.-J. (1993): Les arséniates de cuivre naturels: Systématique et approche des conditions de genèse par les synthèses. Applications au gisement plumbocuprifère de Cap Garonne (Var, France). - Thèse de Doctorat, Université d'Orléans, 293 pp [as "Unnamed (Cu-Al Arsenate)"]; Kolitsch (unpubl. data) ["Unnamed (Cu-Al Arsenate)"]; Mills, S.J., Kampf, A.R., McDonald, A.M., Favreau, G., Chiappero, P.-J. (2012) Forêtite, a new secondary arsenate mineral from the Cap Garonne mine, France. Mineralogical Magazine, 76, 769-777.
Jean-Marie CLAUDE trouvaille and collection (found 08/1980)
Mineral and/or Locality  
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