Unformatted text preview: Flgure 194. Tridymitc fragmenls have
no Cleavage and will therefore have Irreg-
uIar shapes and random orientatmna. Fxc. 13-11 (Lb, “(60) (a) Tridymite surrounding vesicular cavities, and lb= the same area I x polars) showing small twin crystals. TRIM/M #75 Figure 195. Wedge-shaped grains of
mdymile in a sihcic lava. Crossed nic-
0157 Photo |ength is 055 mm. ...
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- Spring '09