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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 after Lu Watters (1911-1989), mineral collector and jazz trumpeter.
This page provides mineralogical data about Wattersite.


Classification of Wattersite

Approved
Approval Year:
1987
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
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

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
Twinning:
About [001], contact twins on {100}

Occurrences of Wattersite

Type Occurrence of Wattersite

Place of Conservation of Type Material:
Smithsonian 165271

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:
Mineralogical Record (1991): 22: 269-272.

Canadian Mineralogist (1995): 33: 41-46.

New Minerals (1997), New Minerals 1990-1994.

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

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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