| Reference Type | Journal (article/letter/editorial) |
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| Title | Thermal expansion of cancrinite |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Hassan, Ishmael | Author |
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| Year | 1996 (December) | Volume | 60 |
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| Issue | 403 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_60/60-403-949.pdf+ |
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| DOI | doi:10.1180/minmag.1996.060.403.09Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 123 | Long-form Identifier | mindat:1:5:123:4 |
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| GUID | 0 |
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| Full Reference | Hassan, Ishmael (1996) Thermal expansion of cancrinite. Mineralogical Magazine, 60 (403) 949-956 doi:10.1180/minmag.1996.060.403.09 |
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| Plain Text | Hassan, Ishmael (1996) Thermal expansion of cancrinite. Mineralogical Magazine, 60 (403) 949-956 doi:10.1180/minmag.1996.060.403.09 |
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| In | (1996, December) Mineralogical Magazine Vol. 60 (403) Mineralogical Society |
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| Abstract/Notes | AbstractThermal expansion coefficients were measured for a cancrinite from Bancroft, Ontario, Canada. Measurements of cell parameters and unit-cell volumes were obtained at room temperature and at heating intervals of 50°C over the temperature range from 50 to 1400°C. The unit-cell parameters for cancrinite increase non-linearly with temperature up to 1200°C and shortly thereafter, the mineral melted. The c parameter increases more rapidly than the a parameter, and the c/a ratio increases linearly with temperature. A plausible thermal expansion mechanism for cancrinite, which is based on the framework expansion that occurs as a function of cavity content, is presented. In the thermal expansion of cancrinite, the short Na-H2O in the H2O-Na—H2O chain expands to form equal distances to the two H2O molecules in the chain. This causes the Na atoms to move towards the plane of the six-membered rings and forces the tetrahedra to rotate and the rings become more planar. The Na atoms then form bonds to all six (O1 and O2) oxygen atoms in a ring; the Na-O1 bonds become shorter and the Na-O2 bonds become longer. These effects cause an increase in both a and c, and thus an increase in the c/a ratio. A similar thermal expansion mechanism operates in the sodalite-group minerals where the six-membered rings and Na-Cl bond are involved. |
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