Poughite Mineral Data

Poughite Mineral Data +

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General Poughite Information

Chemical Formula:

Fe+++2(TeO3)2(SO4)·3(H2O)

Composition:

Molecular Weight = 613.00 gm

Iron 18.22 % Fe 23.44 % FeO

Tellurium 41.63 % Te 52.07 % TeO₂

Hydrogen 0.99 % H 8.82 % H₂O

Sulfur 5.23 % S 13.06 % SO₃

Oxygen 33.93 % O

______ ______

100.00 % 97.39 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₂(TeO₃)₂(SO₄)·3(H₂O)

IMA Status:

Approved IMA 1968

Locality:

Moctezuma mine ("La Bambolla"), Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for Frederick Harvey Pough (1906-), American mineralogist, curator, and writer.

Synonym:

ICSD 34597

PDF 21-435

Poughite Image

Images:

Poughite

Comments: Yellow coatings of poughite on matrix.
Location: Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Poughite Crystallography

Axial Ratios:

a:b:c =0.6802:1:0.5535

Cell Dimensions:

a = 9.66, b = 14.2, c = 7.86, Z = 4; V = 1,078.17 Den(Calc)= 3.78

Crystal System:

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

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

By Intensity(I/I_o): 5.74(1), 7.1(1), 3.239(0.7),

Physical Properties of Poughite

Cleavage:

[010] Perfect, [101] Good

Color:

Brownish yellow, Greenish yellow, Dark yellow.

Density:

3.75

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Poughite

Gladstone-Dale:

CI meas= -0.187 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.178 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2377,KPDmeas= 0.2396,KC= 0.2018

Optical Data:

Biaxial (-), a=1.72, b=1.985, g=1.99, bire=0.2700, 2V(Calc)=14, 2V(Meas)=15-20.

Pleochroism (x):

colorless.

Pleochroism (y):

pale greenish yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Poughite

Electron Density:

r_electron=3.48 gm/cc
note: r_Poughite=3.78 gm/cc.

Fermion Index

Fermion Index = 0.03768
Boson Index = 0.96232

Photoelectric:

PE_Poughite= 144.98 barns/electron
U=PE_Poughite x r_electron= 504.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Poughite is Not Radioactive

Poughite Classification

Dana Class:

34.8.1.1 (34)Selenites - Tellurites - Sulfites

(34.8)Dana Type

(34.8.1)Dana Group

34.8.1.1 Poughite Fe2(TeO3)2(SO4)·3(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

IV/K.09-50 IV - Oxides

IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures

IV/K.09 - Blakeite ? - Poughite series

IV/K.09-10 Blakeite* Fe2(TeO3)3 Cubic ? Cubic

IV/K.09-20 Sonoraite FeTeO3(OH)·(H2O) P 2₁/c 2/m

IV/K.09-30 Emmonsite Fe2Te3O9·2(H2O) P1 1

IV/K.09-40 Rodalquilarite H3Fe2(TeO3)4Cl P1 or P1 Tri

IV/K.09-50 Poughite Fe2(TeO3)2(SO4)·3(H2O) Pmnb 2/m 2/m 2/m

Other Poughite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Poughite :
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 Poughite Specimen Label here :

Poughite

Fe+++2(TeO3)2(SO4)·3(H2O)
Dana No: 34.8.1.1 Strunz No: IV/K.09-50
Locality:

Notes: