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They also used tiny lasers to determine the ages of titanite minerals, which formed in the rock when the magma melded with quartz in the beach sand.

Comparing the ages of the youngest sand grains and the oldest titanite crystals allowed the researchers to estimate that the eruption at Argyle occurred between 1.3 billion and 1.26 billion years ago.

I spent a minute or so following a titanite around, just to see its shell and tentacles up close.

This is a good way to grind or, if you’re clever, farm all sorts of precious Titanite.

Lig′urite, a variety of sphene or titanite.