Mineralogy Database

Yanomamite Mineral Data

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General Yanomamite Information

Help on Chemical  Formula: Chemical Formula: In(AsO4)•2(H2O)
Help on Composition: Composition: Molecular Weight = 289.77 gm
   Indium    39.62 %  In   47.91 % In2O3
   Arsenic   25.86 %  As   39.66 % As2O5
   Hydrogen   1.39 %  H    12.43 % H2O
   Oxygen    33.13 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: In(AsO4)•2(H2O)
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: Mangabeiras granite, Goias state, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name is after "Yanomami", a northern-Brazil indian tribe
Help on Name Pronunciation: Name Pronunciation: Yanomamite + Pronunciation Say YANOMAMITE
Help on Synonym: Synonym: IMA1990-052

Yanomamite Image

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Comments: Gray-blue waxy yanomamite coatings on quartz.
Location: Mangabeira Tin Deposit, Goias, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Yanomamite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1498:1:1.1386
Help on Cell Dimensions: Cell Dimensions: a = 10.446, b = 9.085, c = 10.345, Z = 8; V = 981.76 Den(Calc)= 3.92
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.53(1), 5.7(0.7), 3.874(0.6),

Physical Properties of Yanomamite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Blue green, Light green, Light yellow green.
Help on Density: Density: 3.87
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Yanomamite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1658,KPDmeas= 0.168,KC= 0.1688
Ncalc = 1.65 - 1.66
Help on Optical Data: Optical Data: Biaxial (+), b=1.65, 2V(Meas)=55-76.

Calculated Properties of Yanomamite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Yanomamite =3.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001611039
Boson Index = 0.9998388961
Help on Photoelectric: Photoelectric: PEYanomamite = 129.30 barns/electron
U=PEYanomamite x rElectron Density= 462.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Yanomamite is Not Radioactive

Yanomamite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.01)Variscite Group Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CD.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CD -With only medium-sized cations, RO4:H2O = 1:2
08.CD.10 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m
08.CD.10 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m
08.CD.10 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m
08.CD.10 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m
08.CD.10 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m

Other Yanomamite Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.80,p186,1995) OPTIC PROP.(Am.Min.,Vol.80,p186,1995)
Help on See Also: See Also: Links to other databases for Yanomamite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.CD.10





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