Mackayite Mineral Data

Mackayite Mineral Data +

General Mackayite Information

Chemical Formula:

Fe+++Te2O5(OH)

Composition:

Molecular Weight = 408.05 gm

Iron 13.69 % Fe 19.57 % Fe₂O₃

Tellurium 62.54 % Te 78.22 % TeO₂

Hydrogen 0.25 % H 2.21 % H₂O

Oxygen 23.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺Te₂O₅(OH)

Environment:

Secondary mineral in telluride-bearing ores.

IMA Status:

Valid Species (Pre-IMA) 1944

Locality:

Mohawk mine, Goldfield, Nevada. Link to MinDat.org Location Data.

Name Origin:

Named for John William Mackay (1831-1902), mine operator, Comstock Lode, and benefactor of the Mackay School of Mines, University of Nevada.

Synonym:

ICSD 100139

PDF 29-730

Mackayite Image

Images:

Mackayite

Comments: Greenish brown crystals of mackayite on matrix.
Location: McGuinnity shaft, Goldfield, Esmeralda County, Nevada, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Mackayite Crystallography

Axial Ratios:

a:c = 1:1.27178

Cell Dimensions:

a = 11.704, c = 14.885, Z = 16; V = 2,039.00 Den(Calc)= 5.32

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/acd

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

By Intensity(I/I_o): 3.17(1), 1.61(0.9), 3.32(0.8),

Forms:

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Crystal Structure:

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Pertlik F , Tschermaks Mineralogische und Petrographische Mitteilungen , 13 (1969) p.219-232, Hydrothermalsynthese, formel und struktur von mackayit, Fe(OH)[Te2O5], Locality: synthetic

View Additional jPOWD Structure files for Mackayite
[1]

Physical Properties of Mackayite

Cleavage:

None

Color:

Brownish green, Yellow green, Olive green.

Density:

4.86

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Mackayite

Dichroism (e):

green.

Dichroism (w):

yellowish green.

Gladstone-Dale:

CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2256,KPDmeas= 0.2469,KC= 0.2264

Optical Data:

Uniaxial (+), w=2.19, e=2.21, bire=0.0200.

Calculated Properties of Mackayite

Electron Density:

r_electron=4.67 gm/cc
note: r_Mackayite=5.32 gm/cc.

Fermion Index

Fermion Index = 0.05298
Boson Index = 0.94702

Photoelectric:

PE_Mackayite= 223.27 barns/electron
U=PE_Mackayite x r_electron=1,042.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mackayite is Not Radioactive

Mackayite Classification

Dana Class:

34.6.1.1 (34)Selenites - Tellurites - Sulfites

(34.6)Dana Type

(34.6.1)Dana Group

34.6.1.1 Mackayite FeTe2O5(OH) I 4₁/acd 4/m 2/m 2/m

Strunz Class:

IV/K.12-30 IV - Oxides

IV/K - Tellurides with [Te2O5]2- groups

IV/K.12 - Rayite - Mackayite series

IV/K.12-10 Rajite CuTe2O5 P 2₁/c 2/m

IV/K.12-20 Denningite (Mn,Zn)Te2O5 P 4₁/nbc 4/m 2/m 2/m

IV/K.12-30 Mackayite FeTe2O5(OH) I 4₁/acd 4/m 2/m 2/m

Other Mackayite Information

References:

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

See Also:

Links to other databases for Mackayite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Mackayite

Fe+++Te2O5(OH)
Dana No: 34.6.1.1 Strunz No: IV/K.12-30
Locality:

Notes: