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Wattersite

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Lu Watters
Formula:
(Hg+2)2Hg2+(CrO4)O2
Colour:
Dark red-brown to black
Lustre:
Sub-Metallic
Hardness:
Specific Gravity:
8.91 (Calculated)
Crystal System:
Monoclinic
Name:
Named by Andrew C. Roberts, Maurizio Bonardi, Richard C. Erd, Alan J. Criddle, and Yvon Le Page in 1991 in honor of Lucius "Lu" Watters (19 December 1911, Santa Cruz, California, USA – 5 November 1989, Santa Rosa, California, USA), mineral collector, jazz trumpeter, and environmentalist. He specialized in the mineralogy of the California Coast Ranges.
This page provides mineralogical data about Wattersite.


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Classification of WattersiteHide

Approved
Approval Year:
1987
First Published:
1991
7.FB.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
Dana 7th ed.:
35.4.1.1
35.4.2.1

35 : ANHYDROUS CHROMATES
4 : Miscellaneous
7.14.11

7 : Oxides and Hydroxides
14 : Oxides of Cr

Physical Properties of WattersiteHide

Sub-Metallic
Transparency:
Opaque
Colour:
Dark red-brown to black
Streak:
Dark brick-red
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
Not Observed
Fracture:
Conchoidal
Density:
8.91 g/cm3 (Calculated)

Optical Data of WattersiteHide

Type:
Biaxial
RI values:
nα = 2.440 - 2.520 nγ = 2.700 - 2.860
Max Birefringence:
δ = 0.260 - 0.340
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Type:
Anisotropic
Anisotropism:
Strong; putple, dark blue, bottle-green, bottle-blue, turquoise-blue, dull greenish-blue
Dispersion:
r > v strong
Colour in reflected light:
light greenish white, to lilac-gray
Internal Reflections:
bright deep red
Pleochroism:
Visible
Comments:
R1 darker lilac-gray by comparison with the bright, slightly greenish, white of R2.

Chemical Properties of WattersiteHide

Formula:
(Hg+2)2Hg2+(CrO4)O2
IMA Formula:
Hg1+4Hg2+O2(CrO4)

Crystallography of WattersiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 11.274(2) Å, b = 11.669(2) Å, c = 6.603(1) Å
β = 98.19(2)°
Ratio:
a:b:c = 0.966 : 1 : 0.566
Unit Cell V:
859.81 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic, aggregates, massive.

Large {11O}, {01O}; medium {31O}, {130}; small to medium {021}; small {100}, {101}, {-403}, {011}, {342}; very small {311}; tiny {001}, {111}, {742}, {112}, {312}.
Twinning:
About [001], contact twins on {100}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.655 (100)
8.06 (80)
3.300 (60)
3.260 (60)
5.58 (50)
3.60 (50)
2.948 (50)

Type Occurrence of WattersiteHide

General Appearance of Type Material:
Thin shell-like aggregates and discrete crystals.
Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Canada, 65141.
National Museum of Natural History, Washington, D.C., USA, 165271.
Geological Setting of Type Material:
Mercury deposit
Associated Minerals at Type Locality:

Synonyms of WattersiteHide

Other Language Names for WattersiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cinnabar9 photos of Wattersite associated with Cinnabar on mindat.org.
Edgarbaileyite8 photos of Wattersite associated with Edgarbaileyite on mindat.org.
Mercury4 photos of Wattersite associated with Mercury on mindat.org.
Quartz2 photos of Wattersite associated with Quartz on mindat.org.
Edoylerite1 photo of Wattersite associated with Edoylerite 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.20Deanesmithite(Hg+2)Hg2+3(CrO4)S2OTric.
7.FB.25EdoyleriteHg2+3(CrO4)S2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.14.1EskolaiteCr2O3Trig.
7.14.2BracewelliteCrO(OH)Orth. mmm (2/m 2/m 2/m)
7.14.3GrimaldiiteCrO(OH)Trig.
7.14.4GuyanaiteCrO(OH)Orth.
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19Hex.
7.14.6Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38Trig.
7.14.7McconnelliteCuCrO2Trig.
7.14.8RedledgeiteBa(Ti4+6Cr3+2)O16Tet.
7.14.9HawthorneiteBaMgTi3Cr4Fe2+2Fe3+2O19Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.14.10ZincochromiteZnCr2O4Iso.
7.14.12ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.14.13MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m

Fluorescence of WattersiteHide

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 WattersiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Bonardi, M., Erd, R.C., Criddle, A.J., Le Page, Y. (1991) Wattersite Hg+14Hg+2Cr+6O6 a new mineral from the Clear Creek claim San Benito County, California. The Mineralogical Record: 22: 269-272.
Jambor, J.L. (1992) New mineral names. American Mineralogist: 77: 670-675.
Groat, L.A., Roberts, A.C., Le Page, Y. (1995) The crystal structure of wattersite, Hg1+4Hg2+Cr6+O6. The Canadian Mineralogist: 33: 41-46.
Mandarino, J.A. (1997) New Minerals 1990-1994. Mineralogical Record, Arizona.

Internet Links for WattersiteHide

Localities for WattersiteHide

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)
 
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Picacho Peak
Mineralogical Record: 36(4): 337-363.; Mineralogical Record (1993): 24: 471-475.
    • San Mateo Co.
      • Emerald Lake Hills
Dunning, G.E. et al. (2005): The Clear Creek mine (San Benito County, California): a unique mercury locality. The Mineralogical Record, 36(4), 337-363.
        • Upper Emerald Lake
Erd, R. (1990).
Mineral and/or Locality  
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