Yanomamite Mineral Data

General Yanomamite Information

Chemical Formula:

In(AsO4)•2(H2O)

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

Empirical Formula:

In(AsO₄)•2(H₂O)

IMA Status:

Approved IMA 1994

Locality:

Mangabeiras granite, Goias state, Brazil. Link to MinDat.org Location Data.

Name Origin:

The name is after "Yanomami", a northern-Brazil indian tribe

Name Pronunciation:

Yanomamite + Pronunciation

Synonym:

IMA1990-052

Yanomamite Image

Images:

Yanomamite

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

Axial Ratios:

a:b:c =1.1498:1:1.1386

Cell Dimensions:

a = 10.446, b = 9.085, c = 10.345, Z = 8; V = 981.76 Den(Calc)= 3.92

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.53(1), 5.7(0.7), 3.874(0.6),

Physical Properties of Yanomamite

Cleavage:

{???} Indistinct

Color:

Blue green, Light green, Light yellow green.

Density:

3.87

Diaphaneity:

Transparent

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Yanomamite

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

Optical Data:

Biaxial (+), b=1.65, 2V(Meas)=55-76.

Calculated Properties of Yanomamite

Electron Density:

Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Yanomamite =3.87 gm/cc.

Fermion Index:

Fermion Index = 0.0001611039
Boson Index = 0.9998388961

Photoelectric:

PE_Yanomamite= 129.30 barns/electron
U=PE_Yanomamite x rElectron Density= 462.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Yanomamite is Not Radioactive

Yanomamite Classification

Dana Class:

40.04.01.05 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 · x(H2O)

(40.04.01)Variscite Group

40.04.01.01 Variscite AlPO4•2(H2O) Pcab 2/m 2/m 2/m

40.04.01.02 Strengite FePO4•2(H2O) Pcab 2/m 2/m 2/m

40.04.01.03 Scorodite FeAsO4•2(H2O) Pcab 2/m 2/m 2/m

40.04.01.04 Mansfieldite AlAsO4•2(H2O) Pcab 2/m 2/m 2/m

40.04.01.05 Yanomamite In(AsO4)•2(H2O) P bca 2/m 2/m 2/m

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

References:

PHYS. PROP.(Am.Min.,Vol.80,p186,1995) OPTIC PROP.(Am.Min.,Vol.80,p186,1995)

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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Ask about Yanomamite here :
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Print or Cut-and-Paste your Yanomamite Specimen Label here :

Yanomamite

In(AsO4)•2(H2O)
Dana No: 40.04.01.05 Strunz No: 08.CD.10
Locality:

Notes: