File:Andesitiese Basalt, Hekpoort-formasie, C, Faerie Glen NR.jpg
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current | 20:07, 11 November 2014 | 4,000 × 3,000 (3.93 MB) | JMK | {{Information |Description ={{en|1=Andesitic basalt of the Hekpoort formation in Faerie Glen Nature Reserve, Pretoria. Some of the rock vesicles are filled in with a secondary mineral, to form amygdales. The vesicles were caused by dissolved gasses... |
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