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Deanesmithite

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About DeanesmithiteHide

Deane K. Smith, Jr.
Formula:
(Hg+2)Hg2+3(CrO4)S2O
Colour:
Red, orange
Lustre:
Adamantine
Hardness:
4½ - 5
Specific Gravity:
8.06 (Calculated)
Crystal System:
Triclinic
Name:
Named by A.C. Roberts, J.T. Szymanski, R.C. Erd, A.J. Criddle, M. Bonardi in 1993 in honor of Deane Kingsley Smith, Jr. (8 November 1930, Berkeley, California, USA – 7 September 2001, State College, Pennsylvania, USA), professor at Pennsylvania State University for his contributions to structural and experimental mineralogy. He developed the POWD software for X-ray powder diffraction analysis and cofounded the journal Powder Diffraction.
This page provides mineralogical data about Deanesmithite.


Classification of DeanesmithiteHide

Approved
Approval Year:
1991
First Published:
1993
7.FB.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
Dana 7th ed.:
35.4.3.1
35.4.3.1

35 : ANHYDROUS CHROMATES
4 : Miscellaneous

Physical Properties of DeanesmithiteHide

Adamantine
Transparency:
Transparent
Colour:
Red, orange
Streak:
Red, orange
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {110}, fair on {001}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
8.06 g/cm3 (Calculated)

Optical Data of DeanesmithiteHide

Type:
Biaxial
Pleochroism:
Weak
Comments:
Yellow-orange to dark reddish orange.

Chemical Properties of DeanesmithiteHide

Formula:
(Hg+2)Hg2+3(CrO4)S2O
IMA Formula:
Hg1+2Hg2+3S2O(CrO4)

Crystallography of DeanesmithiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 8.11 Å, b = 9.5 Å, c = 6.81 Å
α = 100.43°, β = 110.24°, γ = 82.8°
Ratio:
a:b:c = 0.854 : 1 : 0.717
Unit Cell V:
483.03 ų (Calculated from Unit Cell)
Z:
2
Morphology:
As bladed to tabular {100} crystals, dominated by {100}, with minor {320}, {001}, {510}, {011}, and a dozen other forms. Striations on {100} parallel to [001].
Twinning:
Indicated in reflected light.

Type Occurrence of DeanesmithiteHide

Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Canada, 65026, 66152.
Geological Setting of Type Material:
In a mercury deposit in silicate–carbonate rock hydrothermally altered from serpentinite.
Associated Minerals at Type Locality:

Synonyms of DeanesmithiteHide

Other Language Names for DeanesmithiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Mercury2 photos of Deanesmithite associated with Mercury on mindat.org.
Edoylerite1 photo of Deanesmithite associated with Edoylerite on mindat.org.
Cinnabar1 photo of Deanesmithite associated with Cinnabar on mindat.org.
Opal1 photo of Deanesmithite associated with Opal on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.FB.05PhoenicochroitePb2(CrO4)OMon.
7.FB.10SantanaitePb11(CrO4)O12Hex. 6 2 2 : P63 2 2
7.FB.15Wattersite(Hg+2)2Hg2+(CrO4)O2Mon. 2/m : B2/b
7.FB.25EdoyleriteHg2+3(CrO4)S2Mon.

Other InformationHide

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 DeanesmithiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Szymanski, J.T., Erd, R.C., Criddle, A.J., Bonardi, M. (1993) Deanesmithite, Hg1+2Hg2+3Cr6+O5S2, a new mineral species from the Clear Creek Claim, San Benito County, California. The Canadian Mineralogist: 31: 787-793.
Jambor, J.L., Roberts, A.C., Vanko, D.A. (1994) New mineral names. American Mineralogist: 79: 1009-1014.
Szymanski, J.T., Groat, L.A. (1997) The crystal structure of deanesmithite, Hg1+2Hg2+3Cr6+O5S2. The Canadian Mineralogist: 35: 765-772.

Internet Links for DeanesmithiteHide

Localities for DeanesmithiteHide

ⓘ - 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)
 
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Goat Mountain
Canadian Mineralogist (1993): 31: 787-793.; Mineralogical Record (1993): 24: 471-475.
Mineral and/or Locality  
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