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Wattersite

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Lu Watters
Formula:
Hg41+Hg2+O2(CrO4)
System:
Monoclinic
Colour:
Dark red-brown to black
Lustre:
Sub-Metallic
Hardness:
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.


Classification of Wattersite

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 Wattersite

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

Optical Data of Wattersite

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 Wattersite

IMA Formula:
Hg41+Hg2+O2(CrO4)
Elements listed in formula:

Crystallography of Wattersite

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 Volume:
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 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)

Occurrences of Wattersite

Type Occurrence of Wattersite

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:

Relationship of Wattersite to other Species

Common Associates:
7.FB.05PhoenicochroitePb2O(CrO4)
7.FB.10SantanaitePb11CrO16
7.FB.20DeanesmithiteHg21+Hg32+S2OCrO4
7.FB.25EdoyleriteHg32+(Cr6+O4)S2
7.14.1EskolaiteCr2O3
7.14.2BracewelliteCrO(OH)
7.14.3GrimaldiiteCrO(OH)
7.14.4GuyanaiteCrO(OH)
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19
7.14.6Mathiasite(Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12
7.14.7McconnelliteCu1+CrO2
7.14.8RedledgeiteBa(Ti64+Cr23+)O16
7.14.9HawthorneiteBaMgTi3Cr4Fe22+Fe23+O19
7.14.10ZincochromiteZnCr2O4
7.14.12ChromiteFe2+Cr2O4
7.14.13MagnesiochromiteMgCr23+O4

Other Names for Wattersite

Name in Other Languages:

Other Information

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 Wattersite

Reference List:
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 Wattersite

mindat.org URL:
https://www.mindat.org/min-4248.html
Please feel free to link to this page.

Localities for Wattersite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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