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Radtkeite

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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 (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.


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Classification of RadtkeiteHide

Approved
Approval Year:
1989
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

Physical Properties of RadtkeiteHide

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
Fracture:
Splintery, Hackly, Conchoidal
Density:
7.0(1) g/cm3 (Measured)    7.05 g/cm3 (Calculated)

Optical Data of RadtkeiteHide

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 RadtkeiteHide

Formula:
Hg2+3S2ICl
IMA Formula:
Hg3S2ClI

Crystallography of RadtkeiteHide

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)°
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)

Type Occurrence of RadtkeiteHide

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:

Synonyms of RadtkeiteHide

Other Language Names for RadtkeiteHide

German:Radtkeit
Spanish:Radtkeita

Common AssociatesHide

CinnabarHgS
CorderoiteHg2+3S2Cl2
Associated Minerals Based on Photo Data:
Kleinite2 photos of Radtkeite associated with Kleinite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.FC.Demicheleite-(I)BiSIOrth. mmm (2/m 2/m 2/m) : Pnma
2.FC.05DjerfisheriteK6(Fe,Cu,Ni)25S26ClIso. m3m (4/m 3 2/m) : Pm3m
2.FC.05ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl
2.FC.05Owensite(Ba,Pb)6(Cu,Fe,Ni)25S27Iso. m3m (4/m 3 2/m) : Pm3m
2.FC.10BartoniteK6Fe20S26STet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.FC.10ChlorbartoniteK6Fe24S26(Cl,S)Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.FC.15aArzakiteHg2+3S2(Br,Cl)2Mon.
2.FC.15aCorderoiteHg2+3S2Cl2Iso. m3 (2/m 3)
2.FC.15cGrechishcheviteHg2+3S2(Br,Cl,I)2Tet.
2.FC.15aLavrentieviteHg2+3S2(Cl,Br)2Mon.
2.FC.15bKenhsuiteHg2+3S2Cl2Orth.
2.FC.20aCapgaronniteAgHgClSOrth.
2.FC.20cPerrouditeHg5Ag4S5(I,Br)2Cl2Orth. 2 2 2 : P21 21 2
2.FC.20bIltisiteHgAgS(Cl,Br)Hex.
2.FC.25Demicheleite-(Br)BiSBrOrth. mmm (2/m 2/m 2/m) : Pnma
2.FC.25Demicheleite-(Cl)BiSClOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

6.5.1CorderoiteHg2+3S2Cl2Iso. m3 (2/m 3)
6.5.2ArzakiteHg2+3S2(Br,Cl)2Mon.
6.5.3LavrentieviteHg2+3S2(Cl,Br)2Mon.
6.5.4GrechishcheviteHg2+3S2(Br,Cl,I)2Tet.
6.5.6CapgaronniteAgHgClSOrth.
6.5.7PerrouditeHg5Ag4S5(I,Br)2Cl2Orth. 2 2 2 : P21 21 2
6.5.8ArdaitePb19Sb13S35Cl7Mon.
6.5.9DadsonitePb23Sb25S60ClTric. 1 : P1
6.5.10RadhakrishnaitePbTe3(Cl,S)2Tet.
6.5.11DjerfisheriteK6(Fe,Cu,Ni)25S26ClIso. m3m (4/m 3 2/m) : Pm3m
6.5.12ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl

Other InformationHide

Notes:
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 RadtkeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 RadtkeiteHide

Localities for RadtkeiteHide

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