Olivine

The garnets in the detritus are accompanied by zircon, spinel, corundum, cyanite, tourmaline, olivine, etc.

The olivine crystals in most basalts are imperfect, lacking clear crystal faces.

To do so, his team mixed together limestone with a crushed silicate mineral that contains magnesium — such as olivine, an olive-tinted mineral that can be found around the world. When heated to furiously high temperatures in a kiln, calcium in the limestone and magnesium in the silicate jiggle and switch sides, like participants in a square dance.