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High-pressure study of a natural cancrinite

Paolo Lotti, G. Diego Gatta, Nicola Rotiroti and Fernando Camara
High-pressure study of a natural cancrinite
American Mineralogist (May 2012) 97 (5-6): 872-882


The high-pressure elastic behavior and the P-induced structure evolution of a natural cancrinite from Cameroun {Na (sub 6.59) Ca (sub 0.93) [Si (sub 6) Al (sub 6) O (sub 24) ](CO (sub 3) ) (sub 1.04) F (sub 0.41) .2H (sub 2) O, a=12.5976(6) Aa, c=5.1168(2) Aa, space group: P6 (sub 3) } were investigated by in situ single-crystal X-ray diffraction under hydrostatic conditions up to 6.63(2) GPa with a diamond-anvil cell. The P-V data were fitted with an isothermal Birch-Murnaghan type equation of state (BM EoS) truncated to the third order. Weighted fit (by the uncertainty in P and V) gave the following elastic parameters: V (sub 0) =702.0(7) Aa (super 3) , K (sub V0) =51(2) GPa, and K (sub V') =2.9(4). A linearized BM EoS was used to fit the a-P and c-P data, giving the following refined parameters: a (sub 0) =12.593(5) Aa, K (sub a0) =64(4) GPa, K (sub a') =4.5(9), for the a-axis, and c (sub 0) =5.112(3) Aa, K (sub c0) =36(1) GPa, K (sub c') =1.9(3) for the c-axis (elastic anisotropy: K (sub a0) :K (sub c0) =1.78:1). A subtle change of the elastic behavior appears to occur at P>4.62 GPa, and so the elastic behavior was also described on the basis of BM EOS valid between 0.0001-4.62 and 5.00-6.63 GPa, respectively. The high-pressure structure refinements allowed the description of the main deformation mechanisms responsible for the anisotropic compression of cancrinite on (0001) and along [0001]. A comparative analysis of the structure evolution in response of the applied pressure and temperature of isotypic materials with cancrinite-like topology is carried out.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 97
Serial Issue: 5-6
Title: High-pressure study of a natural cancrinite
Affiliation: Universita di Milano, Dipartimento di Scienze della Terra, Milan, Italy
Pages: 872-882
Published: 201205
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 53
Accession Number: 2012-056673
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N02°00'00" - N13°00'00", E08°00'00" - E17°00'00"
Secondary Affiliation: CNR, Istituto per la Dinamica dei Processi Ambientali, ITA, ItalyUniversita di Torino, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201229
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