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Césarferreiraite

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About CésarferreiraiteHide

Formula:
Fe2+ Fe3+2(AsO4)2(OH)2·8H2O
Colour:
Pale to yellowish green
Lustre:
Vitreous
Specific Gravity:
2.934 (Calculated)
Crystal System:
Triclinic
Name:
Named in honor of César Mendonça Ferreira (b. 1942) mineralogist who established the Gemological Laboratory of the Federal University of Ouro Preto.
The Arsenate-analogue of ferrolaueite.
Related to stewartite and bendadaite.


Classification of CésarferreiraiteHide

Approved
Approval Year:
2013
First Published:
2014

Physical Properties of CésarferreiraiteHide

Vitreous
Transparency:
Transparent
Colour:
Pale to yellowish green
Streak:
Pale to yellowish green
Cleavage:
Distinct/Good
{010} {100}
Density:
2.934 g/cm3 (Calculated)

Optical Data of CésarferreiraiteHide

Type:
Biaxial (+)
Comments:
RI min=1.747 max=1.754

Chemical Properties of CésarferreiraiteHide

Formula:
Fe2+ Fe3+2(AsO4)2(OH)2·8H2O
IMA Formula:
Fe2+Fe3+2(AsO4)2(OH)2 · 8H2O

Crystallography of CésarferreiraiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.383(2) Å, b = 6.878(2) Å, c = 10.364(3) Å
α = 96.43(4)°, β = 102.29(2)°, γ = 109.17(3)°
Ratio:
a:b:c = 0.783 : 1 : 1.507
Unit Cell V:
347.19 ų (Calculated from Unit Cell)
Z:
1
Morphology:
fibrous

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.85(95)
6.35(100)
3.671(29)
3.158(32)
2.960(39)
2.884(35)
2.680(29)
2.540(23)
Comments:
From Type Description.

Type Occurrence of CésarferreiraiteHide

General Appearance of Type Material:
Single crystals, up to 10 μm long with a thickness of about 1-2 μm, are elongated along [001] and flattened on (100).
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museu de Ciência e Técnica da Escola de Minas, Universidade Federal de Ouro Preto, Praça Tiradentes, Ouro Preto, Brazil, registration number SAA-011
Geological Setting of Type Material:
pegmatite
Associated Minerals at Type Locality:
Reference:
Scholz, R., Chukanov, N.V., Menezes Filho, L.A., Atencio, D., Lagoeiro, L., Belotti, F.M., Chaves, M.L.S.C., Romano, A.W., Brandão, P.R., Belakovskiy, D.I., Pekov, I. (2014) Césarferreiraite, Fe2+Fe23+(AsO4)2(OH)2·8H2O, from Eduardo mine, Conselheiro Pena, Minas Gerais, Brazil: Second arsenate in the laueite mineral group. American Mineralogist: 99(4): 607-611.

Synonyms of CésarferreiraiteHide

Relationship of Césarferreiraite to other SpeciesHide

Other Members of this group:
MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1

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 CésarferreiraiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Scholz, R., Chukanov, N.V., Menezes Filho, L.A.D., Atencio, D., Lagoeiro, L., Belotti, F.M., Chaves, M.L.S.C., Romano, A.W., Branda˜o, P.R., Belakovskiy, D.I. and Pekov, I. (2013) Césarferreiraite, IMA 2012-099. CNMNC Newsletter No. 16, August 2013, page 2700; Mineralogical Magazine: 77: 2695-2709.
Scholz, R., Chukanov, N.V., Menezes Filho, L.A., Atencio, D., Lagoeiro, L., Belotti, F.M., Chaves, M.L.S.C., Romano, A.W., Brandão, P.R., Belakovskiy, D.I., Pekov, I. (2014) Césarferreiraite, Fe2+Fe23+(AsO4)2(OH)2·8H2O, from Eduardo mine, Conselheiro Pena, Minas Gerais, Brazil: Second arsenate in the laueite mineral group. American Mineralogist: 99(4): 607-611.

Internet Links for CésarferreiraiteHide

Localities for CésarferreiraiteHide

ⓘ - 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.
Brazil
 
  • Minas Gerais
    • Conselheiro Pena
Bermanec, V., Scholz, R., Markovic, F., Zigovecki-Gobac, Z., and Chaves, M. L. S. C., 2011, Mineralogy of the Boa Vista pegmatite, Galiléia, Minas Gerais, Brazil: Contributions to the 5th International Symposium on Granitic Pegmatites, Galliski et al., eds., Assoc. Geológica Argentina, Serie D, Publicación Especial 14, p. 33-35.
Scholz, R., Chukanov, N. V., Menezes Filho, L. A., Atencio, D., Lagoeiro, L., Belotti, F. M., ... & Pekov, I. (2014). Césarferreiraite, Fe2+ Fe23+ (AsO4) 2 (OH) 2· 8H2O, from Eduardo mine, Conselheiro Pena, Minas Gerais, Brazil: Second arsenate in the laueite mineral group. American Mineralogist, 99(4), 607-611.
Mineral and/or Locality  
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