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Macroscopic:This schist is lamprophyric, meaning it has a low silica content, thus little to no quartz. The sample comes from a large xenolith in the Popes Harbour dike. Microscopic: Reaction textures are present in thin section. Thin section…

Schist with coarse biotite controlling foliation. Garnets visible in some hand samples. Kyanite blades without preferred orientation--at higher concentration within folds. Possibly from the Walloomsac schist.

The PPL thin section shows biotite,…

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Hand Sample: Aphanitic, pyroclastic grey-black tuff. Conchoidal fracture pattern from a strike-point on one edge. Weathers to yellow-brown.

Quartz and feldspar exhibit fracturing

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OCR PDF of supplemental information for Karroo- Bird's River Petrographic Suite