| Reference Type | Journal (article/letter/editorial) |
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| Title | Transmission electron microscopy of coexisting low-tridymite polymorphs |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Ashworth, J. R. | Author |
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| Year | 1989 (March) | Volume | 53 |
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| Issue | 369 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_53/53-369-89.pdf+ |
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| DOI | doi:10.1180/minmag.1989.053.369.10Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1477 | Long-form Identifier | mindat:1:5:1477:3 |
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| GUID | 0 |
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| Full Reference | Ashworth, J. R. (1989) Transmission electron microscopy of coexisting low-tridymite polymorphs. Mineralogical Magazine, 53 (369) 89-97 doi:10.1180/minmag.1989.053.369.10 |
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| Plain Text | Ashworth, J. R. (1989) Transmission electron microscopy of coexisting low-tridymite polymorphs. Mineralogical Magazine, 53 (369) 89-97 doi:10.1180/minmag.1989.053.369.10 |
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| In | (1989, March) Mineralogical Magazine Vol. 53 (369) Mineralogical Society |
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| Abstract/Notes | AbstractThree polymorphs of tridymite (MC, PO-10 and MX) have been examined by transmission electron microscopy (TEM), in crystals which also contain lamellae of cristobalite. MX is the least common, and is highly unstable in the electron beam. It occurs as small regions (< 1 µm2) in PO-10 tridymite and at MC/PO-10 boundaries; these regions are interpreted as being strained. A consistent association between PO-10 and the cristobalite lamellae is attributed to the fact that PO-10 can more closely match the low-cristobalite structure than MC can, at boundaries parallel to the plane in which the crystal structures contain layers of SiO4 tetrahedra. An analogous interpretation explains the observation that twin boundaries (associated with 60° or 120° rotation of the layer) are commonly parallel to the layer plane in PO-10 but at high angles to it in MC. Abundant lamellar features, parallel to the same plane in PO-10, are tentatively interpreted as representing twinning by reflection and 180° rotation, which may also account for c* streaking in diffraction patterns. |
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