Korderoit

Korderoit
Splošno
KategorijaII. razred - Sulfidi
Kemijska formulaHg3S2Cl2
Strunzova klasifikacija02.FC.15a
Klasifikacija DANA10.03.03.01
Kristalna simetrijaKubična 2/m3,
prostorska skupina I 213
Osnovna celicaa = 8,940(5) Å, Z=4
Lastnosti
Molekulska masa736,81 g/mol
BarvaBledo oranžno rožnata do rožnata, na svetlobi hitro potemni do svetlo sive in nato črne barve
Kristalni habitKubični kristali so redki, bolj pogosto kot obrobe in zamenjave cinabarita
Kristalni sistemKubični - diploidalni
Trdota3
ProzornostProzoren
GostotaIzračunana: 6,845 g/cm3
Optične lastnostiIzotropen
Lomni količnikn > 2,5
Sklici[1][2][3]

Korderoit je izredno redek živosrebrov sulfidno kloridni mineral s kemijsko formulo Hg3S2Cl2. Kristalizira v kubičnem kristalnem sistemu. Je mehak mineral svetlo sive do črne barve, redko tudi rožnat ali rumen, s trdoto 1,5-2 po Mohsovi lestvici.

Prvič so ga opisali leta 1974 na nahajališču McDermitt Mercury Mines, Nevada, ZDA. Ime je dobil po starem imenu rudnika Old Cordero Mine.[4]

Zgradba

Korderoit tvori vijugaste verige, ki so med seboj prečno povezane z dodarnim Hg2+ ionom. Dolžina vezi med kationom Hg2+ in anionom S2-je 2,422 Å. Kot Hg-S-Hg meri 94,1°, kot S-Hg-S pa 165,1°.

Nahajališča

Glavno nahajališče kordeorita v tipski lokaciji je v zgornjih miocenskih playa sedimentih v 5-7 m debelih conah, približno vzporednih z ležiščem. Jezerski sedimenti na terciarnih riolitskih vulkanskih kamninah vsebujejo tudi riolitski tuf in pepel. Pojavlja se tudi v posameznih izoliranih zrnih, skupaj s cinabaritom kot njegova zamenjava in nizkotemperaturni supegeni mineral.[5]

Sklici

  1. ↑ Handbook of Mineralogy [1]
  2. ↑ Mindat with location data [2]
  3. ↑ Webmineral data [3]
  4. ↑ Mindat, McDermii Mine page [4]
  5. ↑ Berendsen P., Foord E. E., Storey L. O. (1974), Corderoite, first natural occurrence of Hg3S2Cl2, from the Cordero mercury deposit, Humboldt County, Nevada, American Mineralogist, 59, str. 652-655, [5]

Viri

  • Grenchischev O. K., Vasil’ev V. I. (1978), First find of Corderoite (Hg3S2Cl2) in mercury ores of USSR, Doklady, 246/1-6, str. 145.
  • Keller P., Lissner F., Schleid T. (2005), Single-crystal structure determination of Perroudite, Hg5Ag4S5(I,Br)2Cl2, from Tsumeb (Namiba), and its structural relationships to other sulfide halides of mercury and cinnabar, Stuttgart 181/1, str. 1-9.
  • Lavrent’ev Y. G., Vasil’ev V. I. (1986), New finds and data on the composition of corderoite (Hg3S2Cl2). Soviet Geology and Geophysics, 27/12, str. 117-121.
  • Modreski P. J. (1998), Eugene Edward Foord, 1946-1998, The Canadian Mineralogist, 36/2, str. 251-254.

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