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Geology: Walk Through Time

Talc

Talc ore formed from dolomite
Dolomite is a sedimentary rock composed largely of calcium magnesium carbonate. This tan dolomite was formed on an ocean floor. It was then intruded by the darker 1.1 billion year old molten diabase which came up through the Earth's crust. This hot intrusion changed the dolomite into talc.

Precambrian > Proterozoic eon > Mesoproterozoic era > Stenian period

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