Mackayite Mineral Data (original) (raw)

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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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 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/Io): 3.17(1), 1.61(0.9), 3.32(0.8),

Help on Forms: Forms:

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| | Forms:( 1 1 2) ( 1 1 0) ( 1 0 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | --------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Mackayite Structure Window 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

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:

34.06.01.01 (34)Selenites - Tellurites - Sulfites

(34.06)Dana Type

(34.06.01)Dana Group

34.06.01.01 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
15 - WWW-MINCRYST

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

Mackayite

Fe+++Te2O5(OH)
Dana No: 34.06.01.01 Strunz No: 04.JL.10
Locality:

Notes: