Yanomamite Mineral Data

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Yanomamite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Yanomamite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Yanomamite Mineral Data :

Ask about Yanomamite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: