guide to thin section microscopy - Mineralogical Society of America
guide to thin section microscopy - Mineralogical Society of America
guide to thin section microscopy - Mineralogical Society of America
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Guide <strong>to</strong> Thin Section Microscopy<br />
Twinning<br />
Raith, Raase & Reinhardt – February 2012<br />
Figure 3-20. Twinning in minerals (III)<br />
A: Microcline with characteristic cross-hatched twinning (<strong>section</strong> approximately parallel <strong>to</strong> (001)). B: Microcline,<br />
twin set (<strong>section</strong> approximately parallel <strong>to</strong> (001)). C: Chessboard albite, formed by albitization <strong>of</strong> microcline.<br />
D-F: Leucite with complex lamellar twinning. G: Grossular (anomalous-birefringent) with concentricoscillating<br />
zoning and sec<strong>to</strong>r twins. H: Uvarovite (anomalous-birefringent) with sec<strong>to</strong>r twins. I: Larnite with <strong>thin</strong><br />
polysynthetic twins on (100) and (010). J,K. Calcite with polysynthetic glide twins on {0112}. L: Corundum with<br />
twin lamellae on {1011}.<br />
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