Wattersite
Wattersite is a rare mercury chromate mineral with the formula Hg+14Hg+2Cr+6O6.[2] It occurs in association with native mercury and cinnabar in a hydrothermally altered serpentinite.[3] It was first described from Clear Creek claim, San Benito County, California, USA in 1961.[5] It was named to honor Californian mineral collector Lucius "Lu" Watters.[3]
Wattersite | |
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![]() Black crystals of wattersite with yellowish zones of edgarbaileyite. Locality: Clear Creek claim (Clear Creek Mine), Picacho Peak, New Idria District, Diablo Range, San Benito Co., California, USA. Dimensions: 6.6 cm x 4.8 cm x 4.1 cm | |
General | |
Category | Chromate mineral |
Formula (repeating unit) | Hg+14Hg+2Cr+6O6 |
IMA symbol | Wte[1] |
Strunz classification | 7.FB.15 |
Dana classification | 35.4.2.1 |
Crystal system | Monoclinic |
Crystal class | 2/m |
Space group | C2/c (number 15) |
Unit cell | 859.81 ų |
Identification | |
Color | Dark red-brown to black |
Crystal habit | Prismatic, aggregates, massive |
Twinning | [001], contact twins on {100} |
Cleavage | None |
Fracture | Conchoidal |
Tenacity | Brittle |
Mohs scale hardness | 4.5 |
Luster | Sub-Metallic |
Streak | Brick red |
Diaphaneity | Opaque |
Specific gravity | 8.91 |
Optical properties | Biaxial |
Refractive index | nα = 2.440 - 2.520 nγ = 2.700 - 2.860 |
Birefringence | δ = 0.260 - 0.340 |
Pleochroism | Visible |
Dispersion | r > v strong |
References | [2][3][4] |
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- "Wattersite". MinDat. Retrieved 29 April 2017.
- Handbook of Mineralogy
- Groat, L.A.; Roberts, A.C.; Le Page, Y. (1995). "The crystal structure of wattersite, Hg4HgCrO6". The Canadian Mineralogist. 33: 41–46.
- Roberts, Andrew C.; Bonardi, Maurizio; Erd, Richard C.; Criddle, Alan J.; Le Page, Yvon (1991). "Wattersite Hg+14Hg+2Cr+6O6 a new mineral from the Clear Creek claim San Benito Country, California". The Mineralogical Record. 22: 269–272.
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