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Markascherite

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Mark Ascher
Formula:
Cu3(MoO4)(OH)4
Colour:
Green
Lustre:
Sub-Adamantine
Hardness:
3½ - 4
Specific Gravity:
4.216 (Calculated)
Crystal System:
Monoclinic
Name:
The mineral is named after its finder, Mark Goldberg Ascher, a mineral collector and engineer in Tucson, Arizona, USA.
Dimorph of:
Topology of the structure is very similar to that of deloryite.


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Classification of MarkascheriteHide

Approved
Approval Year:
2010

Physical Properties of MarkascheriteHide

Sub-Adamantine
Transparency:
Transparent
Colour:
Green
Streak:
Green
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
Density:
4.216 g/cm3 (Calculated)

Optical Data of MarkascheriteHide

Type:
Biaxial (-)
Dispersion:
Strong, r > v.
Comments:
All the refractive indices > 1.8.

Chemical Properties of MarkascheriteHide

Formula:
Cu3(MoO4)(OH)4
IMA Formula:
Cu3(MoO4)(OH)4

Crystallography of MarkascheriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.9904(6) Å, b = 5.9934(4) Å, c = 5.5255(4) Å
β = 97.428(4)°
Ratio:
a:b:c = 1.667 : 1 : 0.922
Unit Cell V:
328.04 ų
Z:
2
Morphology:
The dominant forms are {001}, {100}, and {010}.
Twinning:
Twinning is found with the twofold twin axis along [101].

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.124 (65)
4.948 (100)
3.450 (54)
3.299 (51)
3.006 (53)
2.736 (55)
2.580 (88)
2.122 (60)
Comments:
Calculated data.

Type Occurrence of MarkascheriteHide

General Appearance of Type Material:
Crystals are bladed (elongated along the b axis), up to 0.50 x 0.10 x 0.05 mm.
Place of Conservation of Type Material:
A part of the cotype sample has been deposited at the University of Arizona Mineral Museum (catalog 19291) and a part is in the RRUFF Project (deposition R100030).
Geological Setting of Type Material:
The mineral is of secondary origin from the breakdown of primary molybdenite, bornite, chalcocite, and chalcopyrite.
Associated Minerals at Type Locality:

Synonyms of MarkascheriteHide

Other InformationHide

Notes:
Insoluble in water, acetone, or hydrochloric acid.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MarkascheriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H. and Bloch, E.M. (2010) Markascherite, IMA 2010-051. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.
Yang, H., Jenkins, R.A., Thompson, R.M., Downs, R.T., Evans, S.H. and Bloch, E.M. (2012): Markascherite, Cu3(MoO4)(OH)4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A. American Mineralogist, 97, 197-202.

Internet Links for MarkascheriteHide

Localities for MarkascheriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Arizona
    • Pinal Co.
      • Galiuro Mts
        • Bunker Hill District (Copper Creek District)
          • Copper Creek (Copper Creek Canyon)
            • Copper Creek
Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H. and Bloch, E.M. (2010) Markascherite, IMA 2010-051. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.
Mineral and/or Locality  
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