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Poyarkovite

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Formula:
Hg3OCl
System:
Monoclinic
Colour:
cherry red, darkening to ...
Lustre:
Adamantine, Vitreous
Hardness:
2 - 2½
Name:
for Vlakimir Erastovich Poyarkov (1907–1975), Institute of Mineral Resources, Alma-Ata, Kyrgyzstan, "well-known investigator of mercury and antimony deposits"
This page provides mineralogical data about Poyarkovite.


Classification of Poyarkovite

Approved
3.DD.10

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
10.5.2.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq
8.5.4

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
5 : Halides of Zn and Hg

Physical Properties of Poyarkovite

Adamantine, Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
cherry red, darkening to dark red, purple
Streak:
Cherry to cinnabar red
Hardness (Mohs):
2 - 2½
Hardness (Vickers):
VHN20=188 kg/mm2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal
Density:
9.50 - 9.80 g/cm3 (Measured)    9.64 g/cm3 (Calculated)

Optical Data of Poyarkovite

Type:
Anisotropic
Anisotropism:
Strong - color varying from sky-blue to brown-red or from violet to gray
Colour in reflected light:
white with a weak bluish gray tint
Internal Reflections:
purple, purple-red or crimson-red internal reflections are common in air
Pleochroism:
Weak
Comments:
RI n above 2.0

Chemical Properties of Poyarkovite

IMA Formula:
Hg3OCl
Elements listed in formula:

Crystallography of Poyarkovite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group Setting:
C2/c
Cell Parameters:
a = 18.82Å, b = 9.02Å, c = 16.79Å
β = 112.4°
Ratio:
a:b:c = 2.086 : 1 : 1.861
Unit Cell Volume:
V 2,635.15 ų (Calculated from Unit Cell)
Z:
24
Twinning:
twins
Comment:
Also see Pervukhina, N. V., & Romanenko, G. V. (1999)

Type Occurrence of Poyarkovite

General Appearance of Type Material:
grains
Place of Conservation of Type Material:
Central Siberian Geological Museum, Siberian Branch, Acad. Sci.
Geological Setting of Type Material:
oxidation zone of cinnabar depposits
Associated Minerals at Type Locality:

Relationship of Poyarkovite to other Species

3.DD.05EglestoniteHg61+OCl3(OH)
3.DD.05KadyreliteHg61+Br3O1.5
3.DD.15HanawaltiteHg61+Hg2+O3Cl2
3.DD.20TerlinguaiteHg2OCl
3.DD.25PinchiteHg5O4Cl2
3.DD.30Gianellaite[(NHg2)2](SO4)(H2O)x, x~0
3.DD.30MosesiteHg2N(Cl,SO4,MoO4,CO3) · H2O
3.DD.35KleiniteHg2N(Cl,SO4) · nH2O
3.DD.40TedhadleyiteHg2+Hg101+O4I2(Cl,Br)2
3.DD.45VasilyeviteHg201+O6I3Br2Cl(CO3)
3.DD.50AurivilliusiteHg1+Hg2+OI
3.DD.55TerlinguacreekiteHg32+O2Cl2
3.DD.60KelyaniteHg12SbO6BrCl2
3.DD.65ComancheiteHg552+N243-(NH2,OH)4(Cl,Br)34
8.5.1SimonkolleiteZn5(OH)8Cl2 · H2O
8.5.2CalomelHgCl
8.5.3TerlinguaiteHg2OCl
8.5.5PinchiteHg5O4Cl2
8.5.6EglestoniteHg61+OCl3(OH)
8.5.7KadyreliteHg61+Br3O1.5
8.5.8ComancheiteHg552+N243-(NH2,OH)4(Cl,Br)34
8.5.9KuzminiteHg(Br,Cl)
8.5.10MoscheliteHgI
8.5.11Tocornalite(Ag,Hg)I

Other Names for Poyarkovite

Name in Other Languages:

Other Information

Other Information:
The mineral is instantly blackened by KOH, decomposed by HNO3, does not react with HCl. When heated in a closed tube, turns brown, red, then yellow (formation of montroydite) and finally sublimes completely as Hg + calomel.
Special Storage/
Display Requirements:
It is unstable when extracted from a primary place of "conservation", and it eventually transforms completely to an X-ray-amorphous substance
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 Poyarkovite

Reference List:
Vasil'yev, V. I., Lavrent'yev, Y. G., & Pal'chik, N. A. (1982). Poyarkovite, Hg3ClO, a new natural mercury oxychloride. International Geology Review, 24(3), 363-366.

Fleischer M, Chao G Y, Mandarino J A (1982) New mineral names. American Mineralogist 67: 860.

Pervukhina, N. V., & Romanenko, G. V. (1999). New Data on the Mercury Oxide-chloride Mineral Poyarkovite: the Second Find, and Crystal. Structure Determination. Canadian Mineralogist 37:119-126

Internet Links for Poyarkovite

mindat.org URL:
https://www.mindat.org/min-3276.html
Please feel free to link to this page.

Localities for Poyarkovite

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.
Germany
 
  • Rhineland-Palatinate
    • Palatinate
      • Kirchheimbolanden
        • Mörsfeld
H. Hensel and U. Kolitsch (2005): New mineral finds from Palatine mercury deposits (Part 3): Poyarkovite from Mörsfeld. Aufschluss 56, 141-146. (in German)
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
[Lapis 1993:11 p11-24]
      • Fergana Valley
[ZVMO,(1981) 110, 501-506; Lapis 11:11-24]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Vasil'yev, V. I., Lavrent'yev, Y. G., & Pal'chik, N. A. (1982). Poyarkovite, Hg3CIO, a new natural mercury oxychloride. International Geology Review, 24(3), 363-366.
Russia
 
  • Eastern-Siberian Region
    • Tuva Republic
      • Pii-Khem District
        • Uyuk Range
Canadian Mineralogist Feb. 1999; Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
          • Oorash-Khem River Valley
Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
Mineral and/or Locality  
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