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Martyite

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Blue Cap Mine, Paradox Valley District, Paradox Valley, San Juan Co., Utah, USA

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Formula:
Zn
 
3
(V
 
2
O
 
7
)(OH)
 
2
 · 2H
 
2
O
System:TrigonalColour:pale orange yellow
Hardness:3
Name:
Named for Mr. Joe Marty (1945- ), American medical technologist and mineral collector/micromounter, a member of the micromounters hall of fame, in recognition for his contributions to mineralogy.


Zn analogue of Volborthite

Classification of Martyite

IMA status:Approved 2007
Strunz 9th edition ID:8.FD.05
Nickel-Strunz 10th (pending) edition ID:8.FD.05

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
D : Polyphosphates, etc., with OH and H2O
Dana 8th edition ID:40.3.10.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
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Type Occurrence of Martyite

Type Locality:Blue Cap Mine, Paradox Valley District, Paradox Valley, San Juan Co., Utah, USA
General Appearance of Type Material:a V-U oxide-replacement assemblage developed at the expense of organnic material
Place of Conservation of Type Material:Natural History Museum of Los Angeles County, California, USA(catalog numbers 58610 and 58611)
Associated Minerals at type locality:
RossitePyriteMontroseiteGypsum

Physical Properties of Martyite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:pale orange yellow
Hardness (Mohs):3
Tenacity:Flexible
Cleavage:Perfect
perfect on {001} and good on {110}
Comment:thin flakes slightly flexible, coarser plates brittle with a curved fracture
Density (measured):3.37(3) g/cm3
Density (calculated):3.375 g/cm3

Crystallography of Martyite

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:P3m1
Cell Parameters:a = 6.0818Å, c = 7.1793Å
Ratio:a:c = 1 : 1.18
Unit Cell Volume:V 229.97 ų
Z:1
Morphology:thin plates and flakes with {001} prominent. A poorly developed {110} also observed
X-Ray Powder Diffraction:
d-spacingIntensity
7.211 (100)
4.252 (20)
2.968 (50)
2.628 (35)
2.470 (40)
1.773 (20)
1.513 (20)
1.485 (25)

Optical Data of Martyite

Type:Uniaxial (+)
RI values: nω = 1.793() nε = 1.806(3)
Maximum Birefringence:δ = 0.013

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Strong
Comments:O (red-orange) >> E (yellow)

Chemical Properties of Martyite

Formula:
Zn
 
3
(V
 
2
O
 
7
)(OH)
 
2
 · 2H
 
2
O
Essential elements:H, O, V, Zn
All elements listed in formula:H, O, V, Zn

Relationship of Martyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.FD.05Volborthite
Cu
 
3
(V
 
2
O
 
7
)(OH)
 
2
 · 2H
 
2
O

Other Names for Martyite

Synonyms:
IMA2007-026
Other Languages:

Other Information

Other Information:Dissolves rapidly in cold HCl
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Martyite

Reference List:

- +
Kampf, A.R. & I.M. Steele (2008): Martyite, a new mineral sppecies related to volborthite: description and crystal structure. Canadian Mineralogist 46, 687-692.

Internet Links for Martyite

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    • Localities for Martyite

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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • Utah
      • San Juan Co.
        • Paradox Valley
          • Paradox Valley District
    		Can. Min. 46,687-692(2008)
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