Radtkeite
A valid IMA mineral species
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About Radtkeite
Formula:
Hg2+3S2ICl
Colour:
Yellow-orange, darkening on exposure
Lustre:
Adamantine, Sub-Adamantine
Hardness:
2 - 3
Specific Gravity:
7.0
Crystal System:
Monoclinic
Name:
Named in 1991 by John K. McCormack. Frank W. Dickson, and Maureen P. Leshendok in honor of Arthur Sears Radtke (25 September 1936 - 21 July 2004, Santa Clara County, California, USA), geologist of Palo Alto, California, USA in recognition of his long-term research of Carlin-type disseminated gold deposits.
This page provides mineralogical data about Radtkeite.
Unique Identifiers
Mindat ID:
3350
Long-form identifier:
mindat:1:1:3350:9
GUID
(UUID V4):
(UUID V4):
f7c355ae-e6db-4170-adb9-5936b0ecacd6
IMA Classification of Radtkeite
Approved
IMA Formula:
Hg3S2ClI
Approval year:
1989
First published:
1991
Classification of Radtkeite
2.FC.15d
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
C : With Cl, Br, I (halide-sulfides)
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
C : With Cl, Br, I (halide-sulfides)
10.3.6.1
10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
6.5.5
6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides
6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Rdk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Rdk | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Radtkeite
Adamantine, Sub-Adamantine
Transparency:
Translucent, Opaque
Colour:
Yellow-orange, darkening on exposure
Streak:
Yellow-orange
Hardness:
2 - 3 on Mohs scale
Hardness:
VHN100=65 - 75 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
pinacoidal {010} perfect, {001} and {100} very good; prismatic {0kl}, {h0l}, and {hk0} good
pinacoidal {010} perfect, {001} and {100} very good; prismatic {0kl}, {h0l}, and {hk0} good
Fracture:
Splintery, Hackly, Conchoidal
Density:
7.0(1) g/cm3 (Measured) 7.05 g/cm3 (Calculated)
Optical Data of Radtkeite
Type:
Biaxial (+)
Dispersion:
relatively weak
Colour in reflected light:
Pale gray with distinct yellow cast
Internal Reflections:
Canary yellow
Pleochroism:
Visible
Comments:
Bright orange, bright orange with a rosy tint, and bright orange with a greenish tint.
Chemistry of Radtkeite
Mindat Formula:
Hg2+3S2ICl
Elements listed:
Crystallography of Radtkeite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 16.827(4) Å, b = 9.117(1) Å, c = 13.165(5) Å
β = 130.17(2)°
β = 130.17(2)°
Ratio:
a:b:c = 1.846 : 1 : 1.444
Unit Cell V:
1543.2 ų
Z:
8
Comment:
previously reported orthorhombic cell had 20 Angstrom repeat = 2 x c x sin(beta)
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005926 | Radtkeite | Pervukhina N V, Vasil'ev V I, Naumov D Y, Borisov S V, Magarill S A (2004) The crystal structure of synthetic radtkeite, Hg3S2ClI The Canadian Mineralogist 42 87-94 |  | 2004 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.64 Å | (100) |
| 2.71 Å | (44) |
| 3.90 Å | (41) |
| 2.58 Å | (29) |
| 2.53 Å | (28) |
| 2.281 Å | (26) |
| 2.96 Å | (24) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) | |
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Radtkeite
General Appearance of Type Material:
Grains (to 2-microns) and as finely dispersed grains, coatings, and prismatic crystals as long as 30 microns, some of which are hollow, in altered tuffaceous sediments.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA (cat. no. NMNH 168450).
W. M. Keck Minerals Museum of the Mackay School of Mines, University of Nevada, Reno, Nevada, USA.
W. M. Keck Minerals Museum of the Mackay School of Mines, University of Nevada, Reno, Nevada, USA.
Geological Setting of Type Material:
Reaction of hydrothermal solutions with lake sediments.
Associated Minerals at Type Locality:
Reference:
McCormack, J. K., Dickson, F. W., & Leshendok, M. P. (1991) Radtkeite, Hg3S2ClI, a new mineral from the McDermitt mercury deposit, Humboldt County, Nevada. American Mineralogist: 76(9-10): 1715-1721.
Synonyms of Radtkeite
Other Language Names for Radtkeite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 2.FC. | Demicheleite-(I) | BiSI |
| 2.FC.05 | Djerfisherite | K6(Fe,Cu,Ni)25S26Cl |
| 2.FC.05 | Thalfenisite | Tl6(Fe,Ni,Cu)25S26Cl |
| 2.FC.05 | Owensite | (Ba,Pb)6(Cu,Fe,Ni)25S27 |
| 2.FC.05 | Cu-djerfisherite | K6(Cu,Fe)25S26Cl |
| 2.FC.05 | Zoharite | (Ba,K)6(Fe,Cu,Ni)25S27 |
| 2.FC.05 | Gmalimite | K6◻Fe2+24S27 |
| 2.FC.10 | Bartonite | K6Fe20S26S |
| 2.FC.10 | Chlorbartonite | K6Fe24S26(Cl,S) |
| 2.FC.15a | Arzakite | Hg2+3S2(Br,Cl)2 |
| 2.FC.15a | Corderoite | Hg2+3S2Cl2 |
| 2.FC.15c | Grechishchevite | Hg2+3S2(Br,Cl,I)2 |
| 2.FC.15a | Lavrentievite | Hg2+3S2(Cl,Br)2 |
| 2.FC.15b | Kenhsuite | Hg2+3S2Cl2 |
| 2.FC.20a | Capgaronnite | AgHgClS |
| 2.FC.20c | Perroudite | Hg5Ag4S5(I,Br)2Cl2 |
| 2.FC.20b | Iltisite | HgAgSCl |
| 2.FC.20d | Hanauerite | AgHgSI |
| 2.FC.25 | Demicheleite-(Br) | BiSBr |
| 2.FC.25 | Demicheleite-(Cl) | BiSCl |
Other Information
Notes:
Highly sensitive to sunlight, and during exposure it darkens within minutes through shades of yellow-brown to black.
Special Storage/
Display Requirements:
Display Requirements:
Light sensitive
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 Radtkeite
mindat.org URL:
https://www.mindat.org/min-3350.html
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References for Radtkeite
Reference List:
Localities for Radtkeite
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) | |
| McCormack et al. (1991) +2 other references |
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McDermitt Mine, Opalite Mining District, Humboldt County, Nevada, USA