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Artsmithite

This page kindly sponsored by Tony Nikischer
Art Smith with Kidwellite at Coon Creek

Coon Creek Mine, Shady, Polk Co., Arkansas, USA
Formula:
(Hg+2)2Al(PO4)1.74(OH)1.78
generalized as Hg4Al(PO4)2–x(OH)1+3x (x=0.26)
Colour:
Colorless
Lustre:
Adamantine, Vitreous
Specific Gravity:
6.40 (Calculated)
Crystal System:
Monoclinic
Name:
For Mr. Arthur E. Smith Jr. (1935-2009), American petroleum geologist and mineral collector, who originally found the material.
Unique combination of elements; the only known natural mercury phosphate and a rare example of natural Hg oxysalt. The mineral also represents the first reported Hg-Al phosphate, either natural or synthetic.


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Classification of ArtsmithiteHide

Approved
Approval Year:
2002
8.BO.40

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1

Physical Properties of ArtsmithiteHide

Adamantine, Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
Off white to cream
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Comment:
needles are flexible
Density:
6.40 g/cm3 (Calculated)

Optical Data of ArtsmithiteHide

Type:
Biaxial (+)
RI values:
n = >1.80
2V:
Measured: 60°
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r

Chemical Properties of ArtsmithiteHide

Formula:
(Hg+2)2Al(PO4)1.74(OH)1.78

generalized as Hg4Al(PO4)2–x(OH)1+3x (x=0.26)
IMA Formula:
Hg1+4Al(PO4)1.74(OH)1.78

Crystallography of ArtsmithiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 17.022 Å, b = 9.074 Å, c = 7.015 Å
β = 101.2°
Ratio:
a:b:c = 1.876 : 1 : 0.773
Unit Cell V:
1062.9 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.326 (100)
4.739 (50)
4.166 (40)
2.979 (80)
2.952 (50)
2.784 (80)
2.660 (75)
1.755 (50)

Type Occurrence of ArtsmithiteHide

General Appearance of Type Material:
Matted nest (3 x 1 mm) of fibrous to acicular crystals, 0.5 mm in length on average; the length-to-width ratio is over 100:1
Place of Conservation of Type Material:
National Mineral Collection at the Geological Survey of Canada, Ottawa
Geological Setting of Type Material:
Fracture filling in Jackfork sandstone with other mercury minerals; likely a product of breakdown of primary cinnabar and apatite
Associated Minerals at Type Locality:

Synonyms of ArtsmithiteHide

Other Language Names for ArtsmithiteHide

German:Artsmithit
Simplified Chinese:羟磷铝汞石
Traditional Chinese:羥磷鋁汞石

Related Minerals - Nickel-Strunz GroupingHide

8.BO.05NacaphiteNa2Ca(PO4)FMon. 2/m : P21/b
8.BO.10PreisingeriteBi3(AsO4)2O(OH)Tric. 1 : P1
8.BO.10PetitjeaniteBi3(PO4)2O(OH)Tric.
8.BO.10SchumacheriteBi3(VO4)2O(OH)Tric.
8.BO.15AtelestiteBi2(AsO4)O(OH)Mon. 2/m
8.BO.15HechtsbergiteBi2(VO4)O(OH)Mon. 2/m : P21/b
8.BO.15SmrkoveciteBi2(PO4)O(OH)Mon. 2/m : P21/b
8.BO.20KombatitePb14(VO4)2O9Cl4Mon.
8.BO.20SahlinitePb14(AsO4)2O9Cl4Mon.
8.BO.25HeneuiteCaMg5(CO3)(PO4)3(OH)Tric. 1 : P1
8.BO.30NefedoviteNa5Ca4(PO4)4FTric.
8.BO.35Kuznetsovite(Hg+2)Hg2+(AsO4)ClIso. 2 3 : P21 3
8.BO.45SchlegeliteBi7(AsO4)3(MoO4)2O4Orth. mmm (2/m 2/m 2/m)

Fluorescence of ArtsmithiteHide

Other InformationHide

IR Spectrum:
[cm-1]: 3218sh, 3332sh, 3455, 3636 (OH stretching), 1638w (H-O-H bending); 1065, 1009, 976, 921 (phosphate groups)
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 ArtsmithiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Cooper, M.A., Hawthorne, F.C., Gault, R.A., Grice, J.D., Nikischer, A.J. (2003): Artsmithite, a new Hg1+–Al phosphate–hydroxide from the Funderburk prospect, Pike County, Arkansas, U.S.A. Canadian Mineralogist (2003): 41: 721-725; in: Jambor, J.L., Roberts, A.C. (2004) New mineral names. American Mineralogist: 89: 249

Internet Links for ArtsmithiteHide

Localities for ArtsmithiteHide

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.
Brazil
 
  • Santa Catarina
    • São Francisco do Sul
      • Morro do Rócio
Handbook of Mineralogy
USA (TL)
 
  • Arkansas
    • Pike Co.
Roberts, A.C. et al (2003), The Canadian Mineralogist: 41(3): 721-725.
Mineral and/or Locality  
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