Yanomamite Mineral Data

Yanomamite Mineral Data +

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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

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Yanomamite

Electron Density:

r_electron=3.58 gm/cc
note: r_Yanomamite=3.87 gm/cc.

Fermion Index

Fermion Index = 0.00016
Boson Index = 0.99984

Photoelectric:

PE_Yanomamite= 129.30 barns/electron
U=PE_Yanomamite x r_electron= 462.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yanomamite is Not Radioactive

Yanomamite Classification

Dana Class:

40.4.1.5 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.1)Dana Group

40.4.1.1 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.2 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.3 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.4 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

40.4.1.5 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

Strunz Class:

VII/C.09-85 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.09 - Variscite group

VII/C.09-10 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

VII/C.09-88 Parascorodite! FeAsO4·2(H2O) HEX ? Hex

VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Yanomamite

In(AsO4)·2(H2O)
Dana No: 40.4.1.5 Strunz No: VII/C.09-85
Locality:

Notes: