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Chursinite

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Lyudmila Alekseevna Chursina
Formula:
(Hg2+)0.5Hg2+(AsO4)
System:
Monoclinic
Colour:
Yellow-brown to ...
Hardness:
3
Name:
In honour of the Russian theatre and film actress Lyudmila Alekseevna Chursina (1941– ).
Second mercury arsenate mineral after kuznetsovite.

Weil (2004) reports chursinite as the α-(Hg2)3(AsO4)3. In the crystal structure of the synthetic alpha form, 3/4 of oxygen atoms of the arsenate group are linked to three different Hg-Hg pairs, to form puckered layers. Hg coordination is tetrahedral. Hg2 pairs are in dumbbell configuration. Both α and β forms (synthetic, light yellow) have the same space group.

Classification of Chursinite

Approved
8.AD.60

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
38.5.1.1

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
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http://www.mindat.org/min-1048.html
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Type Occurrence of Chursinite

General Appearance of Type Material:
grains to 0.2 mm
Place of Conservation of Type Material:
Institute of Geology and Geophysics, Siberian Division, Academy of Sciences, Novosibirsk, no. XI-41/1; Mining Institute, St. Petersburg, Russia, no. 1678/1
Geological Setting of Type Material:
oxidized zone of Sb-As-Hg deposit

Physical Properties of Chursinite

Adamantine
Diaphaneity (Transparency):
Transparent
Comment:
nearly adamantine
Colour:
Yellow-brown to orange-brown
Comment:
transparent in thin fragments
Streak:
Grayish yellow
Hardness (Mohs):
3
Hardness (Vickers):
VHN100=198 - 245
Comment:
ca. 3
Tenacity:
Brittle
Density:
9.06 g/cm3 (Calculated)
Comment:
data for synthetic material

Crystallography of Chursinite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 8.71(2) Å, b = 5.08(2) Å, c = 15.66(2) Å
β = 128.27(11)°
Ratio:
a:b:c = 1.715 : 1 : 3.083
Unit Cell Volume:
V 544.00 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.05 (100)
2.89 (75)
2.84 (70)
2.49 (50)
2.16 (50)
1.911 (50)
1.883 (50)

Optical Data of Chursinite

Type:
Biaxial
RI values:
n = >2
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Type:
Anisotropic
Anisotropism:
Dark brown to blue-gray
Reflectivity:
460; (16.1–20.4) 546; (15.8–19.7) 590; (14.5–18.5) 656nmR=18.5–22.8%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 18.5–22.8%.
Colour in reflected light:
gray with bluish tint; bluish to bluish white when tarnished
Comments:
Pale brownish yellow to light brown

Chemical Properties of Chursinite

Formula:
(Hg2+)0.5Hg2+(AsO4)
All elements listed in formula:
Analytical Data:
As 9.74
Hg 81.28
O 9.57

total 100.59
Empirical Formula:
Hg2.71As0.87O4.00

Relationship of Chursinite to other Species

8.AD.05NahpoiteNa2HPO4
8.AD.10MonetiteCa(HPO4)
8.AD.10WeiliteCa(HAsO4)
8.AD.10ŠvenekiteCa(H2AsO4)2
8.AD.15Archerite(K,NH4)(H2PO4)
8.AD.15Biphosphammite(NH4,K)(H2PO4)
8.AD.20Phosphammite(NH4)2(HPO4)
8.AD.25BuchwalditeNaCa(PO4)
8.AD.30SchultenitePb(HAsO4)
8.AD.35Chernovite-(Y)Y(AsO4)
8.AD.35DreyeriteBi(VO4)
8.AD.35Wakefieldite-(Ce)Ce(VO4)
8.AD.35Wakefieldite-(Y)Y(VO4)
8.AD.35Xenotime-(Y)Y(PO4)
8.AD.35PretuliteSc(PO4)
8.AD.35Xenotime-(Yb)Yb(PO4)
8.AD.35Wakefieldite-(La)La(VO4)
8.AD.40PucheriteBi(VO4)
8.AD.45XimengiteBi(PO4)
8.AD.50Gasparite-(Ce)Ce(AsO4)
8.AD.50Monazite-(Ce)Ce(PO4)
8.AD.50Monazite-(La)La(PO4)
8.AD.50Monazite-(Nd)Nd(PO4)
8.AD.50RooseveltiteBi(AsO4)
8.AD.50CheraliteCaTh(PO4)2
8.AD.50Monazite-(Sm)Sm(PO4)
8.AD.50UM2005-35-VO:CaFePSiTh(Th,Ca)(VO4,SiO4,PO4)
8.AD.55TetrarooseveltiteBi(AsO4)
8.AD.65ClinobisvaniteBi(VO4)

Other Names for Chursinite

Name in Other Languages:
German:Chursinit
Spanish:Chursinita

Other Information

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 Chursinite

Reference List:
Vasil’ev, V.I., Y.G. Lavrent’ev, Pal’chik, N.A. (1984): Chursinite,
(Hg2)3(AsO4)3, a new natural mercury arsenate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 113: 341–347 (in Russian).

American Mineralogist: 70: 871.

Acta Crystallographica: B29: 1666-1669.

Kamenar, B., Kaitner, B. (1973): The Crystal Structure of Mercury(I) Orthoarsenate. Acta Crystallographica B: 29: 1666.

Weil, M. (2004): A Second Modification of Mercury(I) Orthoarsenate(V): Preparation and Crystal Structure of β-(Hg2)3(AsO4)2. Zeitschrift für Naturforschung B: 59b: 859-864.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for Chursinite

Localities for Chursinite

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.
Australia
 
  • New South Wales
    • Robinson Co.
      • Cobar
Leverett, P., McKinnon, A. R., & Williams, P. A. (2005). Supergene geochemistry of the Endeavor ore body, Cobar, NSW, and relationships to other deposits in the Cobar basin. Regolith 2005–Ten Years of CRC LEME, 191-194.
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
[Lapis 1993:11 p11-24]
      • Fergana Valley
[ZVMO,(1984) 113, 341-347; Lapis 11:11-24]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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