


A lava pipe connecting the mantle to the ground. Black Rock, Wyoming, USA
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Rare lava with its source in the mantle In the southwestern part of Wyoming, there is a volcanic rock area called the Leucite Hills. The lava that can be seen in this area was spewed out between about 3 million and 900,000 years ago, and there are many table-shaped rocks made of lava scattered here and there in the Leucite Hills. The photo at the top shows one of them, Black Rock. There are several types of lava, but the lava in the Leucite Hills is a very rare type called lamproite. The lamproite lava was formed over a billion years ago when the mantle underwent chemical changes deep underground, […]