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Yanomamite

Big Photo

Mangabeira Tin Mine, Monte Alegre de Goiás, Mangabeira Massif, Goiás, Central-West Region, Brazil
© Maurice de Graaf

Show Yanomamite Photos (5)
Formula:
InAsO
 
4
·2H
 
2
O
System:OrthorhombicColour:Pale green to yellow ...
Hardness:3 - 4
Name:Named after the Yanomani people of the Amazon basin.


Variscite Group

Forms a partial series with Scorodite.

Classification of Yanomamite

IMA status:Approved 1990
Strunz 8th edition ID:7/C.09-85
Nickel-Strunz 10th (pending) edition ID:8.CD.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
Dana 8th edition ID:40.4.1.5

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
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Type Occurrence of Yanomamite

Type Locality:Mangabeira Tin Mine, Monte Alegre de Goiás, Mangabeira Massif, Goiás, Central-West Region, Brazil
General Appearance of Type Material:dipyramidal crystals, to 0.2 mm; typically in crusts

Physical Properties of Yanomamite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Pale green to yellow green.
Streak:White
Hardness (Mohs):3 - 4
Hardness (Vickers):VHN25=571 - 743 kg/mm2

Crystallography of Yanomamite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbca (P21/b 21/c 21/a)
Cell Parameters:a = 10.446(6) Å, b = 9.085(4) Å, c = 10.345(6) Å
Ratio:a:b:c = 1.15 : 1 : 1.139
Unit Cell Volume:V 981.8 ų
Z:8

Epitaxial Relationships of Yanomamite

Epitaxial Minerals:
Scorodite
Epitaxi Comments:overgrown by scorodite
X-Ray Powder Diffraction:
d-spacingIntensity
5.70 (70)
5.16 (40)
4.53 (100)
4.163 (50)
3.874 (60)
3.250 (60)
3.110 (50)

Optical Data of Yanomamite

Type:Biaxial (+)
Dispersion:relatively strong

Chemical Properties of Yanomamite

Formula:
InAsO
 
4
·2H
 
2
O
Essential elements:As, H, In, O
All elements listed in formula:As, H, In, O
Common Impurities:Fe,Al

Relationship of Yanomamite to other Species

Series:Forms a series with Scorodite (see here)
Related Minerals - Nickel-Strunz Grouping):
8.CD.05Kolbeckite
ScPO
 
4
·2H
 
2
O
8.CD.05Metavariscite
AlPO
 
4
·2H
 
2
O
8.CD.05Phosphosiderite
FePO
 
4
·2H
 
2
O
8.CD.10Mansfieldite
AlAsO
 
4
·2H
 
2
O
8.CD.10Scorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.10Strengite
FePO
 
4
·2H
 
2
O
8.CD.10Variscite
AlPO
 
4
·2H
 
2
O
8.CD.15Parascorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.20Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CD.25Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
8.CD.30Rollandite
Cu
 
3
(AsO
 
4
)
 
2
·4H
 
2
O

Other Names for Yanomamite

Synonyms:
IMA1990-052
German names:
Yanomamit
Spanish names:
Yanomamita

Other Information

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

References for Yanomamite

Reference List:Botelho, N.F., Roger, G., D`Yvoire, F., Moëlo, Y. & Volfinger, M. (1994): Yanomamite, InAsO4.2H2O, a new indium mineral from topaz-bearing greisen in the Goiás Tin Province, Brazil. European Journal of Mineralogy: 6: 245-254.
[Am.Min. 80, 186(1995)(abstract)]

Tang, X., Gentiletti, M. J. & Lachgar, A. (2002): Synthesis and crystal structure of indium arsenate and phosphate dihydrates with variscite and metavariscite structure types. Journal of Chemical Crystallography 31, 45-50.

Chen, Z.-X., Weng, L.-H., Zhou, Y.-M., Zhang, H.-Y. & Zhao, D.-Y. (2002): Synthesis and structure of a new three-dimensional microporous indium arsenate. Huaxue Xuebao 60, 305-309. (in Chinese)

Internet Links for Yanomamite

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  • Raman and XRD data at RRUFF project
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  • Yanomamite details from Handbook of Mineralogy (PDF)
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    Localities for Yanomamite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Central-West Region
      • Goiás
        • Mangabeira Massif
          • Monte Alegre de Goiás
    		Eur.Jour.Min. 6:245
    Mineral and/or Locality
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