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 (II)<br />
A: Chlori<strong>to</strong>id, lamellar twins on (001). B: Mg-rich chlorite (clinochlore), lamellar twins on (001). C: Cumming<strong>to</strong>nite,<br />
<strong>thin</strong> twin lamellae on (100). D: Plagioclase laths with polysynthetic, lamellar twins. E-G: Polysynthetic<br />
twinning in plagioclase. H: Sanidine, Carlsbad twins. I: K-feldspar, Baveno growth twin. J,K:<br />
Cordierite, cyclic twinning on {110} (triplet). First-order red plate inserted in K for better birefringence<br />
contrast. L: Lamellar twins in cordierite.<br />
(Pho<strong>to</strong>micrograph K: Bernardo Cesare, University <strong>of</strong> Padova)<br />
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