Emmonsite Mineral Data

Emmonsite Mineral Data +

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General Emmonsite Information

Chemical Formula:

Fe+++2Te++++3O9·2(H2O)

Composition:

Molecular Weight = 674.52 gm

Iron 16.56 % Fe 23.67 % Fe₂O₃

Tellurium 56.75 % Te 70.98 % TeO₂

Hydrogen 0.60 % H 5.34 % H₂O

Oxygen 26.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂Te₃O₉·2(H₂O)

Environment:

Secondary mineral formed by oxidation of Tellurium bearing minerals.

IMA Status:

Valid Species (Pre-IMA) 1885

Locality:

Tombstone, Tombstone District, Cochise County, Arizona, USA Link to MinDat.org Location Data.

Name Origin:

Named for S. F. Emmons

Synonym:

Durdenite

ICSD 9259

PDF 7-404

Emmonsite Image

Images:

Emmonsite

Comments: Quartz with small blebs of pea green emmonsite.
Location: Barrbolla Mine, Moctezuma, Sonora, Mexico. Scale: Bleb size 2 mm.
© John Veevaert

Images:

Emmonsite Schmitterite

Comments: Yellow schmitterite with green emmonsite.
Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Emmonsite

Comments: Green, mossy emmonsite on matrix..
Location: Moctezuma, Sonora, Mexico. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Emmonsite Crystallography

Axial Ratios:

a:b:c =0.982:1:0.9437

Cell Dimensions:

a = 7.874, b = 8.018, c = 7.567, Z = 2; alpha = 95.6°, beta = 94.3°, gamma = 84.7° V = 472.09 Den(Calc)= 4.74

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.14(1), 2.52(0.9), 2.87(0.9),

Crystal Structure:

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Pertlik F , Tschermaks Mineralogische und Petrographische Mitteilungen , 18 (1972) p.157-168, Der strukturtyp von emmonsit, {Fe2[TeO3]3*H2O}*xH2O (x=0-1), Locality: Tombstone, Arizona, USA

Physical Properties of Emmonsite

Cleavage:

[010] Perfect

Color:

Yellow, Greenish yellow.

Density:

4.52 - 4.53, Average = 4.52

Diaphaniety:

Transparent to Translucent

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Optical Properties of Emmonsite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2224,KPDmeas= 0.2329,KC= 0.2354

Optical Data:

Biaxial (-), a=1.962, b=2.09, g=2.1-2.12, bire=0.1380-0.1580, 2V(Calc)=28-48, 2V(Meas)=23. Dispersion relatively strong.

Calculated Properties of Emmonsite

Electron Density:

r_electron=4.03 gm/cc
note: r_Emmonsite=4.53 gm/cc.

Fermion Index

Fermion Index = 0.04898
Boson Index = 0.95102

Photoelectric:

PE_Emmonsite= 201.19 barns/electron
U=PE_Emmonsite x r_electron= 809.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Emmonsite is Not Radioactive

Emmonsite Classification

Dana Class:

34.3.3.1 (34)Selenites - Tellurites - Sulfites

(34.3)Dana Type

(34.3.3)Dana Group

34.3.3.1 Emmonsite Fe2Te3O9·2(H2O) P1 1

Strunz Class:

IV/K.09-30 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 Emmonsite Information

References:

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

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

Emmonsite

Fe+++2Te++++3O9·2(H2O)
Dana No: 34.3.3.1 Strunz No: IV/K.09-30
Locality:

Notes: