Markascherite, Cu 3(MoO 4)(OH) 4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A.

H. Yang, R. A. Jenkins, R. M. Thompson, Robert T Downs, S. H. Evans, E. M. Bloch

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A new mineral species, markascherite (IMA2010-051), ideally Cu 3(MoO 4)(OH) 4, has been found at Copper Creek, Pinal County, Arizona, U.S A. The mineral is of secondary origin and is associated with brochantite, antlerite, lindgrenite, wulfenite, natrojarosite, and chalcanthite. Markascherite crystals are bladed (elongated along the b axis), up to 0.50 × 0.10 × 0.05 mm. The dominant forms are {001}, {100}, and {010}. Twinning is found with the twofold twin axis along [101]. The mineral is green, transparent with green streak and vitreous luster. It is brittle and has a Mohs hardness of 3.5∼4; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.216 g/cm 3. Optically, markascherite is biaxial (-), with n α >1.8, n β > 1.8, and n γ >1.8. The dispersion is strong (r > v). It is insoluble in water, acetone, or hydrochloric acid. An electron microprobe analysis yielded an empirical formula Cu 2.89(Mo 1.04O 4)(OH) 4. Markascherite, polymorphic with szenicsite, is monoclinic, with space group P2 1/m and unit-cell parameters a = 9.9904(6), b = 5.9934(4), c = 5.5255(4) Å, β = 97.428(4)°, and V = 328.04(4) Å 3. Its structure is composed of three nonequivalent, markedly distorted Cu 2+(O,OH) 6 octahedra and one MoO 4 tetrahedron. The Cu1 and Cu2 octahedra share edges to form brucite-type layers parallel to (100), whereas the Cu3 octahedra share edges with one another to form rutile-type chains parallel to the b axis. These layers and chains alternate along [100] and are interlinked together by both MoO 4 tetrahedra and hydrogen bonds. Topologically, the structure of markascherite exhibits a remarkable resemblance to that of deloryite, Cu 4(UO 2)(MoO 4) 2(OH) 6, given the coupled substitution of [2Cu 2+ + 2(OH-)] 2+ for [(U 6+ + □) + 2O 2 -] 2+. The Raman spectra of markascherite are compared with those of two other copper molybdate minerals szenicsite and lindgrenite.

Original languageEnglish (US)
Pages (from-to)197-202
Number of pages6
JournalAmerican Mineralogist
Volume97
Issue number1
DOIs
StatePublished - Jan 2012

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new mineral
Minerals
Copper
Molybdate minerals
minerals
copper
mineral
wulfenite
Magnesium Hydroxide
tetrahedrons
brucite
twinning
Hydrochloric Acid
Twinning
Electron probe microanalysis
hydrochloric acid
luster
rutile
Acetone
acetone

Keywords

  • Copper oxysalt
  • Crystal structure
  • Markascherite
  • Molybdate
  • Raman spectra
  • Szenicsite
  • X-ray diffraction

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Markascherite, Cu 3(MoO 4)(OH) 4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A. / Yang, H.; Jenkins, R. A.; Thompson, R. M.; Downs, Robert T; Evans, S. H.; Bloch, E. M.

In: American Mineralogist, Vol. 97, No. 1, 01.2012, p. 197-202.

Research output: Contribution to journalArticle

Yang, H. ; Jenkins, R. A. ; Thompson, R. M. ; Downs, Robert T ; Evans, S. H. ; Bloch, E. M. / Markascherite, Cu 3(MoO 4)(OH) 4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A. In: American Mineralogist. 2012 ; Vol. 97, No. 1. pp. 197-202.
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title = "Markascherite, Cu 3(MoO 4)(OH) 4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A.",
abstract = "A new mineral species, markascherite (IMA2010-051), ideally Cu 3(MoO 4)(OH) 4, has been found at Copper Creek, Pinal County, Arizona, U.S A. The mineral is of secondary origin and is associated with brochantite, antlerite, lindgrenite, wulfenite, natrojarosite, and chalcanthite. Markascherite crystals are bladed (elongated along the b axis), up to 0.50 × 0.10 × 0.05 mm. The dominant forms are {001}, {100}, and {010}. Twinning is found with the twofold twin axis along [101]. The mineral is green, transparent with green streak and vitreous luster. It is brittle and has a Mohs hardness of 3.5∼4; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.216 g/cm 3. Optically, markascherite is biaxial (-), with n α >1.8, n β > 1.8, and n γ >1.8. The dispersion is strong (r > v). It is insoluble in water, acetone, or hydrochloric acid. An electron microprobe analysis yielded an empirical formula Cu 2.89(Mo 1.04O 4)(OH) 4. Markascherite, polymorphic with szenicsite, is monoclinic, with space group P2 1/m and unit-cell parameters a = 9.9904(6), b = 5.9934(4), c = 5.5255(4) {\AA}, β = 97.428(4)°, and V = 328.04(4) {\AA} 3. Its structure is composed of three nonequivalent, markedly distorted Cu 2+(O,OH) 6 octahedra and one MoO 4 tetrahedron. The Cu1 and Cu2 octahedra share edges to form brucite-type layers parallel to (100), whereas the Cu3 octahedra share edges with one another to form rutile-type chains parallel to the b axis. These layers and chains alternate along [100] and are interlinked together by both MoO 4 tetrahedra and hydrogen bonds. Topologically, the structure of markascherite exhibits a remarkable resemblance to that of deloryite, Cu 4(UO 2)(MoO 4) 2(OH) 6, given the coupled substitution of [2Cu 2+ + 2(OH-)] 2+ for [(U 6+ + □) + 2O 2 -] 2+. The Raman spectra of markascherite are compared with those of two other copper molybdate minerals szenicsite and lindgrenite.",
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T1 - Markascherite, Cu 3(MoO 4)(OH) 4, a new mineral species polymorphic with szenicsite, from Copper Creek, Pinal County, Arizona, U.S.A.

AU - Yang, H.

AU - Jenkins, R. A.

AU - Thompson, R. M.

AU - Downs, Robert T

AU - Evans, S. H.

AU - Bloch, E. M.

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N2 - A new mineral species, markascherite (IMA2010-051), ideally Cu 3(MoO 4)(OH) 4, has been found at Copper Creek, Pinal County, Arizona, U.S A. The mineral is of secondary origin and is associated with brochantite, antlerite, lindgrenite, wulfenite, natrojarosite, and chalcanthite. Markascherite crystals are bladed (elongated along the b axis), up to 0.50 × 0.10 × 0.05 mm. The dominant forms are {001}, {100}, and {010}. Twinning is found with the twofold twin axis along [101]. The mineral is green, transparent with green streak and vitreous luster. It is brittle and has a Mohs hardness of 3.5∼4; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.216 g/cm 3. Optically, markascherite is biaxial (-), with n α >1.8, n β > 1.8, and n γ >1.8. The dispersion is strong (r > v). It is insoluble in water, acetone, or hydrochloric acid. An electron microprobe analysis yielded an empirical formula Cu 2.89(Mo 1.04O 4)(OH) 4. Markascherite, polymorphic with szenicsite, is monoclinic, with space group P2 1/m and unit-cell parameters a = 9.9904(6), b = 5.9934(4), c = 5.5255(4) Å, β = 97.428(4)°, and V = 328.04(4) Å 3. Its structure is composed of three nonequivalent, markedly distorted Cu 2+(O,OH) 6 octahedra and one MoO 4 tetrahedron. The Cu1 and Cu2 octahedra share edges to form brucite-type layers parallel to (100), whereas the Cu3 octahedra share edges with one another to form rutile-type chains parallel to the b axis. These layers and chains alternate along [100] and are interlinked together by both MoO 4 tetrahedra and hydrogen bonds. Topologically, the structure of markascherite exhibits a remarkable resemblance to that of deloryite, Cu 4(UO 2)(MoO 4) 2(OH) 6, given the coupled substitution of [2Cu 2+ + 2(OH-)] 2+ for [(U 6+ + □) + 2O 2 -] 2+. The Raman spectra of markascherite are compared with those of two other copper molybdate minerals szenicsite and lindgrenite.

AB - A new mineral species, markascherite (IMA2010-051), ideally Cu 3(MoO 4)(OH) 4, has been found at Copper Creek, Pinal County, Arizona, U.S A. The mineral is of secondary origin and is associated with brochantite, antlerite, lindgrenite, wulfenite, natrojarosite, and chalcanthite. Markascherite crystals are bladed (elongated along the b axis), up to 0.50 × 0.10 × 0.05 mm. The dominant forms are {001}, {100}, and {010}. Twinning is found with the twofold twin axis along [101]. The mineral is green, transparent with green streak and vitreous luster. It is brittle and has a Mohs hardness of 3.5∼4; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.216 g/cm 3. Optically, markascherite is biaxial (-), with n α >1.8, n β > 1.8, and n γ >1.8. The dispersion is strong (r > v). It is insoluble in water, acetone, or hydrochloric acid. An electron microprobe analysis yielded an empirical formula Cu 2.89(Mo 1.04O 4)(OH) 4. Markascherite, polymorphic with szenicsite, is monoclinic, with space group P2 1/m and unit-cell parameters a = 9.9904(6), b = 5.9934(4), c = 5.5255(4) Å, β = 97.428(4)°, and V = 328.04(4) Å 3. Its structure is composed of three nonequivalent, markedly distorted Cu 2+(O,OH) 6 octahedra and one MoO 4 tetrahedron. The Cu1 and Cu2 octahedra share edges to form brucite-type layers parallel to (100), whereas the Cu3 octahedra share edges with one another to form rutile-type chains parallel to the b axis. These layers and chains alternate along [100] and are interlinked together by both MoO 4 tetrahedra and hydrogen bonds. Topologically, the structure of markascherite exhibits a remarkable resemblance to that of deloryite, Cu 4(UO 2)(MoO 4) 2(OH) 6, given the coupled substitution of [2Cu 2+ + 2(OH-)] 2+ for [(U 6+ + □) + 2O 2 -] 2+. The Raman spectra of markascherite are compared with those of two other copper molybdate minerals szenicsite and lindgrenite.

KW - Copper oxysalt

KW - Crystal structure

KW - Markascherite

KW - Molybdate

KW - Raman spectra

KW - Szenicsite

KW - X-ray diffraction

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