Mineralogy Database

Mackayite Mineral Data

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General Mackayite Information

Help on Chemical  Formula: Chemical Formula: Fe+++Te2O5(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+Te2O5(OH)
Help on Environment: Environment: Secondary mineral in telluride-bearing ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1944
Help on Locality: Locality: Mohawk mine, Goldfield, Nevada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John William Mackay (1831-1902), mine operator, Comstock Lode, and benefactor of the Mackay School of Mines, University of Nevada.
Help on Name Pronunciation: Name Pronunciation: Mackayite + Pronunciation Say MACKAYITE
Help on Synonym: Synonym: ICSD 100139
  PDF 29-730

Mackayite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:1.27178
Help on Cell Dimensions: Cell Dimensions: a = 11.704, c = 14.885, Z = 16; V = 2,039.00 Den(Calc)= 5.32
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.17(1), 1.61(0.9), 3.32(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 2) ( 1 1 0) ( 1 0 0)

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Physical Properties of Mackayite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish green, Yellow green, Olive green.
Help on Density: Density: 4.86
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light green

Optical Properties of Mackayite

Help on Dichroism (e): Dichroism (e): green.
Help on Dichroism (w): Dichroism (w): yellowish green.
Help on Gladstone-Dale: 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
Ncalc = 2.1 - 2.2
Help on Optical Data: Optical Data: Uniaxial (+), w=2.19, e=2.21, bire=0.0200.

Calculated Properties of Mackayite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.67 gm/cc
note: Specific Gravity of Mackayite =5.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEMackayite = 223.27 barns/electron
U=PEMackayite x rElectron Density=1,042.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mackayite is Not Radioactive

Mackayite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.06)Dana Type
  (34.06.01)Dana Group Mackayite FeTe2O5(OH) I 41/acd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.JL.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JL -Tellurites with additional anions, without H2O
04.JL.10 Mackayite FeTe2O5(OH) I 41/acd 4/m 2/m 2/m

Other Mackayite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Mackayite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.JL.10





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