Yanomamite
A valid IMA mineral species
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About Yanomamite
Yanomami woman and her child
Formula:
InAsO4 · 2H2O
Colour:
Pale green to yellow green to greenish-yellow, not white.
Lustre:
Vitreous, Sub-Vitreous, Waxy
Hardness:
3 - 4
Specific Gravity:
3.876 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named after the Yanomami people of the Amazon basin, a group of approximately 35,000 indigenous people who live in some 200–250 villages in the Amazon rainforest on the border between Venezuela and Brazil.
Isostructural with:
May be overgrown by an outer zone of white scorodite.
Unique Identifiers
Mindat ID:
4352
Long-form identifier:
mindat:1:1:4352:2
IMA Classification of Yanomamite
Approved
IMA Formula:
In3+As5+O4·2H2O
Approval year:
1990
First published:
1994
Classification of Yanomamite
8.CD.10
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
40.4.1.5
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Yan | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Yanomamite
Vitreous, Sub-Vitreous, Waxy
Transparency:
Transparent, Translucent
Colour:
Pale green to yellow green to greenish-yellow, not white.
Comment:
Yanomamite has been widely sold as white crystals in translucent topaz with or without brown cassiterite, etc. No analyses available to confirm that yanomanite may be pure milky white.
Streak:
White
Hardness:
3 - 4 on Mohs scale
Hardness:
VHN25=571 - 743 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Density:
3.876 g/cm3 (Calculated)
Optical Data of Yanomamite
Type:
Biaxial (+)
Dispersion:
relatively strong
Optical Extinction:
Parallel
Chemistry of Yanomamite
Mindat Formula:
InAsO4 · 2H2O
Element Weights:
Elements listed:
Common Impurities:
Fe,Al
Crystallography of Yanomamite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
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 V:
981.8 ų
Z:
8
Epitaxial Relationships of Yanomamite
Epitaxial Minerals:
| 'Scorodite' | Fe3+AsO4 · 2H2O |
Epitaxy Comments:
overgrown by white scorodite
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.70 Å | (70) |
| 5.16 Å | (40) |
| 4.53 Å | (100) |
| 4.163 Å | (50) |
| 4.124 Å | (15) |
| 3.874 Å | (60) |
| 3.421 Å | (20) |
| 3.408 Å | (20) |
| 3.250 Å | (60) |
| 3.110 Å | (50) |
| 3.083 Å | (30) |
| 2.748 Å | (20) |
| 2.743 Å | (15) |
| 2.656 Å | (40) |
| 2.618 Å | (30) |
| 2.610 Å | (20) |
| 2.587 Å | (15) |
| 2.541 Å | (40) |
| 2.365 Å | (15) |
| 2.328 Å | (8) |
| 2.222 Å | (20) |
| 2.219 Å | (20) |
| 2.214 Å | (15) |
| 2.156 Å | (`15) |
| 2.084 Å | (10) |
| 2.078 Å | (8) |
| 2.042 Å | (10) |
| 2.025 Å | (8) |
| 1.787 Å | (10) |
| 1.6923 Å | (10) |
| 1.6867 Å | (9) |
| 1.6285 Å | (8) |
Comments:
Botelho, Roger, d'Yvoire, Moel0, and Volfinger
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Yanomamite
General Appearance of Type Material:
dipyramidal crystals, to 0.2 mm; typically in crusts
Place of Conservation of Type Material:
Instituto de Geociencias, Universidade de Brasilia, Brazil, and in the Museum of the Ecole Nationale Superieure des Mines de Paris, France.
Associated Minerals at Type Locality:
Synonyms of Yanomamite
Other Language Names for Yanomamite
Relationship of Yanomamite to other Species
Member of:
Other Members of Variscite Group:
| Mansfieldite | AlAsO4 · 2H2O | Orth. mmm(2/m2/m2/m) : Pbca |
| Scorodite | Fe3+AsO4 · 2H2O | Orth. mmm(2/m2/m2/m) |
| Strengite | FePO4 · 2H2O | Orth. mmm(2/m2/m2/m) : Pbca |
| Variscite | AlPO4 · 2H2O | Orth. mmm(2/m2/m2/m) : Pbca |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.CD. | Castellaroite | Mn2+3(AsO4)2 · 4H2O |
| 8.CD. | Sergeysmirnovite | MgZn2(PO4)2 · 4H2O |
| 8.CD.05 | Phosphosiderite | FePO4 · 2H2O |
| 8.CD.05 | Metavariscite | AlPO4 · 2H2O |
| 8.CD.05 | Bonacinaite | Sc(AsO4) · 2H2O |
| 8.CD.05 | Kolbeckite | ScPO4 · 2H2O |
| 8.CD.10 | Mansfieldite | AlAsO4 · 2H2O |
| 8.CD.10 | Scorodite | Fe3+AsO4 · 2H2O |
| 8.CD.10 | Variscite | AlPO4 · 2H2O |
| 8.CD.10 | Strengite | FePO4 · 2H2O |
| 8.CD.15 | Parascorodite | FeAsO4 · 2H2O |
| 8.CD.20 | Ludlamite | Fe2+3(PO4)2 · 4H2O |
| 8.CD.25 | Sterlinghillite | Mn2+3(AsO4)2 · 3H2O |
| 8.CD.30 | Rollandite | Cu3(AsO4)2 · 4H2O |
| 8.CD.35 | Liversidgeite | Zn6(PO4)4 · 7H2O |
| 8.CD.40 | Thorasphite | Th2H(PO4,AsO4)3 · 6H2O |
Fluorescence of Yanomamite
Not fluorecent in UV
Other Information
Magnetism:
Non-Magnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Yanomamite
mindat.org URL:
https://www.mindat.org/min-4352.html
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References for Yanomamite
Reference List:
Botelho, Nilson F.; Roger, Guy; d'Yvoire, Ferdinand; Moëlo, Yves; Volfinger, Marcel (1994) Yanomamite, InAsO4.2H2O, a new indium mineral from topaz-bearing greisen in the Goiás Tin Province, Brazil. European Journal of Mineralogy, 6 (2). 245-254 doi:10.1127/ejm/6/2/0245
Tang, XueJiao, Gentiletti, Maria J., Lachgar, Abdessadek (2001) Synthesis and crystal structure of indium arsenate and phosphate dihydrates with variscite and metavariscite structure types. Journal of Chemical Crystallography, 31 (1). 45-50 doi:10.1023/a:1013778603055
Moura, M. A., Botelho, N. F., de Mendonca, F. C. (2007) The indium-rich sulfides and rare arsenates of the Sn-In-mineralized Mangabeira A-type granite, Central Brazil. The Canadian Mineralogist, 45 (3). 485-496 doi:10.2113/gscanmin.45.3.485
Gomez, Mario A., Le Berre, Jean-Francois, Assaaoudi, Hassane, Demopoulos, George P. (2011) Raman spectroscopic study of the hydrogen and arsenate bonding environment in isostructural synthetic arsenates of the variscite group-M3+AsO4·2H2O (M3+ = Fe, Al, In and Ga): implications for arsenic release in water. Journal of Raman Spectroscopy, 42 (1). 62-71 doi:10.1002/jrs.2639
Localities for Yanomamite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Brazil (TL) | |
| Eur.Jour.Min. 6:245 +2 other references |
Portugal | |
| DGEG et al. (Alves et al., 2010) +1 other reference |
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Periquito mine, Mangabeira tin deposit, Monte Alegre de Goiás, Goiás, Brazil