Gaildunningite
A valid IMA mineral species
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About Gaildunningite
Gail Dunning, 1937-2021
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 (January 13, 1937 San Jose, California - March 26, 2021), 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.
Unique Identifiers
Mindat ID:
52997
Long-form identifier:
mindat:1:1:52997:2
IMA Classification of Gaildunningite
Approved
IMA Formula:
Hg2+3[NHg2+2]18(Cl,I)24
Approval year:
2018
First published:
2019
Type description reference:
Cooper, Mark A., Hawthorne, Frank C., Roberts, Andrew C., Stanley, Christopher J., Spratt, John, Christy, Andrew 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 doi:10.3749/canmin.1800080
Classification of Gaildunningite
3.DD.70
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gai | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gaildunningite
Adamantine, Vitreous
Transparency:
Transparent
Colour:
Yellow to orange to darker orange-red
Streak:
Orange
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Very Good
very good cleavage on {100} and {010} and good cleavage on {001}
very good cleavage on {100} and {010} and good cleavage on {001}
Parting:
None
Fracture:
Irregular/Uneven
Density:
8.22 g/cm3 (Calculated)
Chemistry of Gaildunningite
Mindat Formula:
Hg2+3[NHg2+2]18(Cl,I,OH,Br,S)24
Crystallography of Gaildunningite
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.965 Å | (40) |
| 5.717 Å | (50) |
| 5.018 Å | (40) |
| 2.853 Å | (100) |
| 2.776 Å | (100) |
| 2.745 Å | (100) |
| 2.690 Å | (35) |
| 1.673 Å | (40) |
Reference:
Cooper, Mark A., Hawthorne, Frank C., Roberts, Andrew C., Stanley, Christopher J., Spratt, John, Christy, Andrew 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 doi:10.3749/canmin.1800080
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Gaildunningite
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, Mark A., Hawthorne, Frank C., Roberts, Andrew C., Stanley, Christopher J., Spratt, John, Christy, Andrew 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 doi:10.3749/canmin.1800080
Synonyms of Gaildunningite
Other Language Names for Gaildunningite
Dutch:Gaildunningiet
German:Gaildunningit
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 3.DD. | Mikecoxite | [CHg4]OCl2 |
| 3.DD.05 | Eglestonite | [Hg2]2+3OCl3(OH) |
| 3.DD.05 | Kadyrelite | [Hg2]2+3OBr3(OH) |
| 3.DD.10 | Poyarkovite | [Hg2]2+3Cl2O2 |
| 3.DD.15 | Hanawaltite | [Hg2]2+3Hg2+(Cl,OH)2O3 |
| 3.DD.20 | Terlinguaite | [Hg3]4+Hg2+Cl2O2 |
| 3.DD.25 | Pinchite | Hg2+5Cl2O4 |
| 3.DD.30 | Gianellaite | [(Hg2N)2](SO4)(H2O)x |
| 3.DD.30 | Mosesite | (Hg2N)(Cl,SO4,MoO4) · H2O |
| 3.DD.35 | Kleinite | (Hg2N)(Cl,SO4) · nH2O |
| 3.DD.40 | Tedhadleyite | [Hg2]2+5Hg2+I2(Cl,Br)2O4 |
| 3.DD.45 | Vasilyevite | [Hg2]2+10I3Br2Cl[CO3]O6 |
| 3.DD.50 | Aurivilliusite | [Hg2]2+Hg2+2(I,Br,Cl)2O2 |
| 3.DD.55 | Terlinguacreekite | Hg2+3Cl2O2 |
| 3.DD.60 | Kelyanite | [Hg]2+6Sb3+BrCl2O6 |
| 3.DD.65 | Comancheite | Hg2+55N3-24(NH2,OH)4(Cl,Br)34 |
Fluorescence of Gaildunningite
None
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.
Internet Links for Gaildunningite
mindat.org URL:
https://www.mindat.org/min-52997.html
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External Links:
References for Gaildunningite
Reference List:
Dunning, Gail E., Hadley, Ted A., Magnasco, John, Christy, Andrew G., Cooper, Joseph F. Jr. (2005) The Clear Creek mine, San Benito County, California: a unique mercury locality. The Mineralogical Record, 36 (4) Tucson. 337-363[as unnamed phase 'CCDUK-10']
Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2018) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 44. European Journal of Mineralogy, 30 (4) 877-882 doi:10.1127/ejm/2018/0030-2787p.881
Cooper, Mark A., Hawthorne, Frank C., Roberts, Andrew C., Stanley, Christopher J., Spratt, John, Christy, Andrew 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 doi:10.3749/canmin.1800080
Localities for Gaildunningite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Cooper et al. (2019) |
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Clear Creek claim, Goat Mountain, San Benito County, California, USA