Martyite Mineral Data

General Martyite Information

Chemical Formula:

Zn3V2O7(OH)2•2H2O

Composition:

Molecular Weight = 468.09 gm

Calcium 0.43 % Ca 0.60 % CaO

Vanadium 21.77 % V 38.86 % V₂O₅

Zinc 37.16 % Zn 46.25 % ZnO

Cobalt 1.89 % Co 2.40 % CoO

Hydrogen 1.33 % H 11.89 % H₂O

Oxygen 37.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn_2.66Co_0.15Ca_0.05V⁵⁺₂O₇(OH)_1.72•2.23(H₂O)

Environment:

Formed from post-mining leaching and oxidation of V-U oxide replacements of organic matter.. Zn-dominant analogue of volborthite.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Blue Cap mine, about 15 km east of La Sal, San Juan Co., Utah, USA Link to MinDat.org Location Data.

Name Origin:

Named for its discoverer, Joe Marty, of Salt Lake City, Utah, who is also responsible for the discovery of three other new minerals from the same area.

Synonym:

IMA2007-026

Martyite Image

Images:

Martyite

Comments: Clusters of yellow flakes and coarser red-orange plates of martyite on V-U replacement of organic material.
Location: Blue Cap mine, near La Sal, San Juan County, Utah, USA. Scale: Picture size 1.4 mm.
© Canadian Mineralogist

Martyite Crystallography

Axial Ratios:

a:c = 1:1.18045

Cell Dimensions:

a = 6.0818, c = 7.1793, Z = 1; V = 229.97 Den(Calc)= 3.38

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 7.211(1), 2.968(0.5), 2.47(0.4),2.628(0.35), 1.485(0.25), 1.513(0.2), 1.773(0.2), 4.252(0.2),

Physical Properties of Martyite

Cleavage:

{001} Perfect, {110} Good

Color:

Yellow orange, Red orange.

Density:

3.37

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

pale yellow orange

Optical Properties of Martyite

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2371,KPDmeas= 0.2378,KC= 0.2512
Ncalc = 1.85

Optical Data:

Uniaxial (+), w=1.797, e=1.806, bire=0.0090.

Calculated Properties of Martyite

Electron Density:

Bulk Density (Electron Density)=3.23 gm/cc
note: Specific Gravity of Martyite =3.37 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Martyite= 23.41 barns/electron
U=PE_Martyite x rElectron Density= 75.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Martyite is Not Radioactive

Martyite Classification

Dana Class:

40.03.10.02 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 · x(H2O)

(40.03.10)Dana Group

40.03.10.01 Volborthite Cu3V2O7(OH)2•2(H2O) C 2/m 2/m

40.03.10.02 Martyite! Zn3V2O7(OH)2•2H2O P 3m1 3 2/m

Strunz Class:

08.FD.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates

08.FD -Polyphosphates, etc, with OH and H2O

08.FD.05 Volborthite Cu3V2O7(OH)2•2(H2O) C 2/m 2/m

08.FD.05 Martyite! Zn3V2O7(OH)2•2H2O P 3m1 3 2/m

Other Martyite Information

References:

NAME( CanMin v43:687) PHYS. PROP.(CanMin v43:687) OPTIC PROP.(CanMin v43:687)

See Also:

Links to other databases for Martyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Martyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Martyite

Zn3V2O7(OH)2•2H2O
Dana No: 40.03.10.02 Strunz No: 08.FD.05
Locality:

Notes: