Foordite Mineral Data

Foordite Mineral Data +

General Foordite Information

Chemical Formula:

Sn++(Nb,Ta)2O6

Composition:

Molecular Weight = 444.54 gm

Tantalum 20.35 % Ta 24.85 % Ta₂O₅

Niobium 31.35 % Nb 44.85 % Nb₂O₅

Tin 26.70 % Sn 30.30 % SnO

Oxygen 21.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SnNb_1.5Ta_0.5O₆

IMA Status:

Approved IMA 1988

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 202827

PDF 45-1350

Foordite Image

Images:

Foordite

Comments: Brownish massive foordite.
Location: Manono, Shaba (Katanga), Congo (Za?re). Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Foordite Crystallography

Axial Ratios:

a:b:c =3.5042:1:1.1399

Cell Dimensions:

a = 17.097, b = 4.879, c = 5.562, Z = 4; beta = 90.85° V = 463.91 Den(Calc)= 6.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.849(1), 3.071(0.5), 3.1(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Ercit T S , Cerny P , The Canadian Mineralogist , 26 (1988) p.899-903, The crystal structure of foordite

Physical Properties of Foordite

Cleavage:

[???] Perfect

Color:

Brownish yellow.

Density:

6.734

Diaphaniety:

Translucent

Hardness:

6 - Orthoclase

Luster:

Vitreous - Adamantine

Streak:

yellow white

Optical Properties of Foordite

Gladstone-Dale:

CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2035,KPDmeas= 0.1922,KC= 0.2001

Optical Data:

Biaxial (+), b=2.294

Calculated Properties of Foordite

Electron Density:

r_electron=5.61 gm/cc
note: r_Foordite=6.36 gm/cc.

Fermion Index

Fermion Index = 0.04451
Boson Index = 0.95549

Photoelectric:

PE_Foordite= 371.30 barns/electron
U=PE_Foordite x r_electron=2,082.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Foordite is Not Radioactive

Foordite Classification

Dana Class:

8.3.10.2 (8)Multiple Oxides with Nb, Ta, and Ti

(8.3)where A (B2O6)

(8.3.10)Dana Group

8.3.10.1 Thoreaulite SnTa2O6 C 2/c 2/m

8.3.10.2 Foordite Sn(Nb,Ta)2O6 C 2/c 2/m

Strunz Class:

IV/D.29-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.29 - Badleyite - Uraninite series, Foordite - Thoreaulite

IV/D.29-10 Foordite Sn(Nb,Ta)2O6 C 2/c 2/m

IV/D.29-20 Thoreaulite SnTa2O6 C 2/c 2/m

Other Foordite Information

References:

PHYS. PROP.(Am.Min.,Vol.75,p707,1990) OPTIC PROP.(Am.Min.,Vol.75,p707,1990)

See Also:

Links to other databases for Foordite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

Search for Foordite using:

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

Visit our Advertisers for Foordite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Foordite Mineral Data :

Ask about Foordite 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 Foordite Specimen Label here :

Foordite

Sn++(Nb,Ta)2O6
Dana No: 8.3.10.2 Strunz No: IV/D.29-10
Locality:

Notes: