olivine

The emerald rainstorm contains a bright green mineral of a class called olivine—also known as peridot to us Earth-dwellers.

In the more basic phases anhedrons of augite and of olivine appear, and magnetite grains are usually present.

Olivine occurs in certain of the Rainier lavas, in stout prisms somewhat rounded and often with reddened borders.

It also surrounds olivine in this same rock, which is a hypersthene-andesite, the hornblende and olivine being only accessory.

Hypersthene is not the prevailing pyroxene, and olivine is usually present, often in such abundance as to make the rock a basalt.

Pic′rīte, one of the peridotites or olivine-rocks; Picrotox′ine, a bitter poisonous principle in the seeds of Cocculus indicus.