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Cairncrossite

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Formula:
Sr
 
2
Ca
 
7
(Si
 
4
O
 
10
)
 
4
(OH)
 
2
·15H
 
2
O
System:Triclinic
Name:
Named after Professor Bruce Cairncross, (August 13th, 1953) Head: Department of Geology, University of Johannesburg, Johannesburg, South Africa.




Similar to minerals of the Gyrolite and Reyerite groups.

Classification of Cairncrossite

IMA status:Approved 2013
mindat.org URL:http://www.mindat.org/min-43802.html
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Type Occurrence of Cairncrossite

Type Locality:Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese field, Northern Cape Province, South Africa
Place of Conservation of Type Material:In the collections of the Institute of Mineralogy and Crystallography, University of Vienna, Vienna, Austria, registration number 13079
Associated Minerals at type locality:
SugiliteRichterite

Crystallography of Cairncrossite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 9.624(2) Å, b = 9.634(2) Å, c = 15.657(3) Å
α = 100.80(1)°, β = 91.22(2)°
Ratio:a:b:c = 0.999 : 1 : 1.625
Unit Cell Volume:V nan ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
15.27 (100)
5.091 (11)
4.198 (11)
4.136 (8)
3.818 (19)
3.164 (10)
3.071 (10)
3.061 (9)

Chemical Properties of Cairncrossite

Formula:
Sr
 
2
Ca
 
7
(Si
 
4
O
 
10
)
 
4
(OH)
 
2
·15H
 
2
O
Simplified for copy/paste:Sr2Ca7(Si4O10)4(OH)2·15H2O
Essential elements:Ca, H, O, Si, Sr
All elements listed in formula:Ca, H, O, Si, Sr

Other Names for Cairncrossite

Synonyms:
IMA2013-012
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cairncrossite

Reference List:

- +
Giester, G., Lengauer, C.L., Pristacz, H., Rieck, B. and von Bezing, K.-L. (2013) Cairncrossite, IMA 2013-012. CNMNC Newsletter No. 16, August 2013, page 2703; Mineralogical Magazine, 77, 2695-2709.

Pristacz, H., Giester, G., Rieck, B., Lengauer, C.L. (2013): Thermal behaviour of the new mineral Cairncrossite, Sr2Ca7(Si4O10)4(OH)2·15H2O. Poster, MinPet 2013, September 19-23; abstract in Mitt. Österr. Mineral. Ges. 159 (in press) [http://erdwissenschaften.uni-graz.at/aktuelles/veranstaltungen/minpet2013/downloads/ThirdCircular2013_Final.pdf]

Internet Links for Cairncrossite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Cairncrossite

    The 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. ? 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.
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese field
        • Hotazel
    Giester, G., Lengauer, C.L., Pristacz, H., Rieck, B. and von Bezing, K.-L. (2013) Cairncrossite, IMA 2013-012. CNMNC Newsletter No. 16, August 2013, page 2703; Mineralogical Magazine, 77, 2695-2709.
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