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Gaildunningite

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About GaildunningiteHide

Formula:
Hg2+3[NHg2+2]18(Cl,I,OH,Br,S)24
Colour:
Yellow to orange to darker orange-red
Lustre:
Adamantine, Vitreous
Hardness:
3
Specific Gravity:
8.22 (Calculated)
Crystal System:
Orthorhombic
Name:
The mineral is named after Gail E. Dunning (b. 1937), a prominent field-collector of minerals from the New Idria mining district who has been responsible for the discovery of many new mercury-bearing minerals.
Loosely chemically related to comancheite. Chemically related to Millon's base.



Classification of GaildunningiteHide

Approved
Approval Year:
2018

Physical Properties of GaildunningiteHide

Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellow to orange to darker orange-red
Streak:
orange
Hardness:
Tenacity:
Brittle
Cleavage:
Very Good
very good cleavage on {100} and {010} and good cleavage on {001}
Parting:
None
Fracture:
Irregular/Uneven
Density:
8.22 g/cm3 (Calculated)

Chemical Properties of GaildunningiteHide

Formula:
Hg2+3[NHg2+2]18(Cl,I,OH,Br,S)24

Crystallography of GaildunningiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 26.381(6) Å, b = 45.59(1) Å, c = 6.684(1) Å
Ratio:
a:b:c = 0.579 : 1 : 0.147
Unit Cell V:
8,038.91 ų (Calculated from Unit Cell)
Z:
4
Twinning:
None
Comment:
Space group is Amam

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.965Å(40)
5.717Å(50)
5.018Å(40)
2.853Å(100)
2.776Å(100)
2.745Å(100)
2.690Å(35)
1.673Å(40)

Type Occurrence of GaildunningiteHide

General Appearance of Type Material:
acicular crystals.
Place of Conservation of Type Material:
mineralogical collections of the Department of Natural History, Royal Ontario Museum, 100 Queens Park, Toronto, 880 U. Hålenius et al. Ontario M5S 2C6, Canada, catalogue number M58523
Geological Setting of Type Material:
shallow tabular orebodies of ocherous silicified rock in serpentintite
Associated Minerals at Type Locality:
Reference:
Cooper, M. A., Hawthorne, F. C., Roberts, A. C., Stanley, C. J., Spratt, J., & Christy, A. G. (2019). Gaildunningite, Ideally Hg2+ 3 [NHg2+ 2] 18 (Cl, I) 24, a New Mineral from the Clear Creek Mine, San Benito County, California, USA: Description and Crystal Structure. The Canadian Mineralogist, 57(3), 295-310.

Synonyms of GaildunningiteHide

Fluorescence of GaildunningiteHide

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 GaildunningiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dunning, G.E., Hadley, T.A., Magnasco, J., Christy, A.G., Cooper, J.F., Jr. (2015): The Clear Creek Mine. The Mineralogical Record: 36: 337-363. [as unnamed phase 'CCDUK-10']
Cooper, M.A., Hawthorne, F.C., Roberts, A.C., Stanley, C.J., Spratt, J., and Christy, A.G. (2018): IMA 2018-029. CNMNC Newsletter No. 44, August 2018, page 881; European Journal of Mineralogy: 30: 877–882.
Cooper, M. A., Hawthorne, F. C., Roberts, A. C., Stanley, C. J., Spratt, J., & Christy, A. G. (2019). Gaildunningite, Ideally Hg2+ 3 [NHg2+ 2] 18 (Cl, I) 24, a New Mineral from the Clear Creek Mine, San Benito County, California, USA: Description and Crystal Structure. The Canadian Mineralogist, 57(3), 295-310.

Internet Links for GaildunningiteHide

Localities for GaildunningiteHide

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.
      • New Idria Mining District
        • Goat Mountain
Frank C. Hawthorne, Mark A. Cooper, Andrew C. Roberts, Christopher J. Stanley, John Spratt, and Andrew G. Christy. Gaildunningite, ideally Hg2+32+6]18(Cl,I)24, a new mineral from the Clear Creek mine, San Benito County, California, USA: description and crystal structure. The Canadian Mineralogist, "Online first" (upcoming) paper, https://canminportal.org/upcoming-articles/ (visited 20.04.2019)
 
矿物 and/or 产地  
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