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Radtkeite

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Formula:
Hg32+S2ICl
System:
Orthorhombic
Colour:
Yellow-orange, darkening ...
Hardness:
2 - 3
Name:
Named in 1991 by John K. McCormack. Frank W. Dickson, and Maureen P. Leshendok in honor of Arthur Sears Radtke (1936 - ), 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.

Classification of Radtkeite

Approved
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)
10.3.6.1

10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
6.5.5

6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides
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Type Occurrence of Radtkeite

General Appearance of Type Material:
2-micron grains 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:
Smithsonian Institution, Washington, DC (cat. no. NMNH 168450), and the W. M. Keck Minerals Museum of the Mackay School of Mines, University of Nevada, Reno.
Geological Setting of Type Material:
reaction of hydrothermal solutions with lake sediments
Associated Minerals at Type Locality:

Physical Properties of Radtkeite

Sub-Adamantine
Colour:
Yellow-orange, darkening on exposure
Streak:
Yellow-orange
Hardness (Mohs):
2 - 3
Hardness (Vickers):
VHN100=65 - 75
Tenacity:
Brittle
Cleavage:
Perfect
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)

Crystallography of Radtkeite

Crystal System:
Orthorhombic
Cell Parameters:
a = 16.85(1) Å, b = 20.27(2) Å, c = 9.133(2) Å
Ratio:
a:b:c = 0.831 : 1 : 0.451
Unit Cell Volume:
V 3,119.37 ų (Calculated from Unit Cell)
Z:
16

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

Chemical Properties of Radtkeite

Formula:
Hg32+S2ICl
All elements listed in formula:

Relationship of Radtkeite to other Species

2.FC.Demicheleite-(I)BiSI
2.FC.05DjerfisheriteK6(Fe,Cu,Ni)25S26Cl
2.FC.05ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl
2.FC.05Owensite(Ba,Pb)6(Cu,Fe,Ni)25S27
2.FC.10BartoniteK6Fe20S26S
2.FC.10ChlorbartoniteK6Fe24S26(Cl,S)
2.FC.15aArzakiteHg32+S2(Br,Cl)2
2.FC.15aCorderoiteHg32+S2Cl2
2.FC.15cGrechishcheviteHg32+S2(Br,Cl,I)2
2.FC.15aLavrentieviteHg32+S2(Cl,Br)2
2.FC.15bKenhsuiteHg32+S2Cl2
2.FC.20aCapgaronniteAgHgClS
2.FC.20cPerrouditeHg5Ag4S5(I,Br)2Cl2
2.FC.20bIltisiteHgAgS(Cl,Br)
2.FC.25Demicheleite-(Br)BiSBr
2.FC.25Demicheleite-(Cl)BiSCl
6.5.1CorderoiteHg32+S2Cl2
6.5.2ArzakiteHg32+S2(Br,Cl)2
6.5.3LavrentieviteHg32+S2(Cl,Br)2
6.5.4GrechishcheviteHg32+S2(Br,Cl,I)2
6.5.6CapgaronniteAgHgClS
6.5.7PerrouditeHg5Ag4S5(I,Br)2Cl2
6.5.8ArdaitePb19Sb13S35Cl7
6.5.9DadsonitePb23Sb25S60Cl
6.5.10RadhakrishnaitePbTe3(Cl,S)2
6.5.11DjerfisheriteK6(Fe,Cu,Ni)25S26Cl
6.5.12ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl

Other Names for Radtkeite

Name in Other Languages:
German:Radtkeit
Spanish:Radtkeita

Other Information

Other Information:
highly sensitive to sunlight, and during exposure it darkens within minutes through shades of yellow-brown to black
Special Storage/
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.

References for Radtkeite

Reference List:
McCormack, J. K., Dickson, F. W., & Leshendok, M. P. (1991). Radtkeite, Hg 3 S 2 ClI, a new mineral from the McDermitt mercury deposit, Humboldt County, Nevada. American Mineralogist, 76(9-10), 1715-1721.

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(1), 87-94.

Internet Links for Radtkeite

Specimens:
The following Radtkeite specimens are currently listed for sale on minfind.com.

Localities for Radtkeite

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)
 
  • Nevada
    • Humboldt Co.
      • Opalite District
AM 76 (1991), 1715; HB3 (1997); NM 90-94 (1997)
Mineral and/or Locality  
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