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![[Figure 3]](gj5326fig3mag.jpg)
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Figure 3
{1014} twinned calcite projected along 〈441〉 and its intergrowth with a domain projected along 〈111〉 suggests homo-epitaxy between {1120}//{1120} and {1108}//{1102} interfaces. (a) Complex HRTEM image from sample PRR13081, a subglacial calcite from the East Antarctic Ice Sheet. Fringes with 6.08 and 5.00 Å spacing corresponding, respectively, to doubled  and  spacings are marked by white arrows. (b) FFT calculated from (a) and its interpretation as {1014} twinned calcite domains. White squares and open green circles mark overlapping reflections, and reflections belonging to one domain only are marked by open black and white circles. (c) FFT calculated from (a) and its interpretation as a domain projected along 〈111〉. Green open circles mark overlapping reflections between 〈441〉 and 〈111〉 domains. (d, e and f) FFTs calculated from regions i, ii, and iii of (a) and their interpretation as calcite, {1014} twinned calcite and {1014} twinned calcite intergrown with a domain projected along 〈111〉, respectively. Black and white open circles and green squares mark reflections arising from the individual domains. Overlapping reflections of the twinned domains and those arising from all domains are marked by white squares and green circles, respectively. White and black arrows mark reflections with doubled and  spacings. |
![[Figure 3]](gj5326fig3.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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