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Geology

Is mount coolum a rock?

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09/08/2009

Mt Coolum is a lacolith, a volcanic plug that did not breach the surface. It arose around the same time as the rest of the Glasshouse Mountains but unlike Mt Coolum they breached the surface and became towering volcanic plugs inside their central lava tubes.

Mt Coolum is a felsic igneous rhyolite rock composed of mainly orthoclase feldspar, plagioclae feldspar, and quartz with some minor amounts of biotite and amphibole hornblend.