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Chukhrovite-(Ca)

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Russian mineralogist and geochemist Fedor Vasil’evich Chukhrov.
Formula:
Ca4.5Al2(SO4)F13·12H2O
System:
Isometric
Colour:
Colorless, white
Hardness:
Name:
Named in 2011 by P. Vignola, F. Hatert, Olaf Medenbach, D. Bersani, V. Diella, P. Gentile, and A. Risplendente in honor of Fedor Vasil'evich Chukhrov and for its being the Ca analogue of chukrovite-(Ce).
Very closely related to meniaylovite.

Classification of Chukhrovite-(Ca)

Approved
Approval Year:
2011
mindat.org URL:
http://www.mindat.org/min-41907.html
Please feel free to link to this page.

Type Occurrence of Chukhrovite-(Ca)

General Appearance of Type Material:
Found as low temperature hydrothermal crystallizations covering the surfaces of brittle fractures crosscutting a marcasite and REE-bearing fluorite vein.
Associated Minerals at Type Locality:

Physical Properties of Chukhrovite-(Ca)

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colorless, white
Streak:
White
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
None Observed
Without a distinct cleavage.
Density:
2.23 g/cm3 (Calculated)

Crystallography of Chukhrovite-(Ca)

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Fd3
Cell Parameters:
a = 16.749(1) Å
Unit Cell Volume:
V 4698.6 ų
Z:
8
Morphology:
Sharp octahedra up to 150 µm in diameter.
Comment:
Fd-3
X-Ray Powder Diffraction Data:
d-spacingIntensity
9.665 (100)
5.921 (31)
5.053 (16)
4.190 (10)
3.226 (15)
2.556 (10)
2.182 (12)
1.915 (17)

Optical Data of Chukhrovite-(Ca)

Type:
Isotropic
RI values:
n = 1.432(1)
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemical Properties of Chukhrovite-(Ca)

Formula:
Ca4.5Al2(SO4)F13·12H2O
All elements listed in formula:
Analytical Data:
Empirical formula, based on 3 (Al + S) atoms per formula unit, mean of five point analyses
Empirical Formula:
Ca4.33Na0.11Fe0.03)∑4.47Al2.10(S0. 90O3.72) F13.10·5.98H2O

Relationship of Chukhrovite-(Ca) to other Species

Other Members of Group:
Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2O
Chukhrovite-(Nd)Ca3(Nd,Y)Al2(SO4)F13·12H2O
Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2O
MeniayloviteCa4[F|SO4|SiF6|AlF6] · 12H2O

Other Names for Chukhrovite-(Ca)

Name in Other Languages:

Other Information

Non-fluorescent either under short-wave (254 nm) or long-wave (366 nm) ultraviolet light
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 Chukhrovite-(Ca)

Reference List:
Vignola, P., Hatert, F., Medenbach, O., Bersani, D., Diella, V., Gentile, P. and Risplendente, A. (2011) Chukhrovite-(Ca), IMA 2010-081. CNMNC Newsletter No. 8, April 2011, page 294; Mineralogical Magazine, 75, 289-294.

Vignola, P., Hatert, F., Medenbach, O., Bersani, D., Diella, V., Gentile, P., Risplendente, A. (2012): Chukhrovite-(Ca), Ca4.5Al2(SO4)F13·12H2O, a new mineral species from the Val Cavallizza Pb-Zn-(Ag) mine, Cuasso al Monte, Varese province, Italy. European Journal of Mineralogy, 24, 1069-1076.

Kolitsch, U., Brandstätter, F., Schreiber, F., Fink, R. & Auer, C. (2013): Die Mineralogie der weltweit einzigartigen Schlacken von Waitschach, Kärnten. Annalen des Naturhistorischen Museums in Wien, Serie A, 115, 19-87 (in German).

Internet Links for Chukhrovite-(Ca)

Localities for Chukhrovite-(Ca)

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.
Austria
 
  • Carinthia
    • Friesach - Hüttenberg area
      • Hüttenberg
        • Waitschach
Kolitsch, U., Brandstätter, F., Schreiber, F., Fink, R. & Auer, C. (2013): Die Mineralogie der weltweit einzigartigen Schlacken von Waitschach, Kärnten. Annalen des Naturhistorischen Museums in Wien, Serie A, 115, 19-87 (in German).
Italy (TL)
 
  • Lombardy
    • Varese Province
      • Ceresio Valley
        • Cuasso al Monte
          • Cavagnano
Vignola, P., Hatert, F., Medenbach, O., Bersani, D., Diella, V., Gentile, P. and Risplendente, A. (2011) Chukhrovite-(Ca), IMA 2010-081. CNMNC Newsletter No. 8, April 2011, page 294; Mineralogical Magazine, 75, 289-294; Vignola, P., Hatert, F., Medenbach, O., Bersani, D., Diella, V., Gentile, P., Risplendente, A. (2012): Chukhrovite-(Ca), Ca4.5Al2(SO4)F13·12H2O, a new mineral species from the Val Cavallizza Pb-Zn-(Ag) mine, Cuasso al Monte, Varese province, Italy. European Journal of Mineralogy, 24, 1069-1076.
Mineral and/or Locality  
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