San Carlos peridotite with chrome diopside and spinel in volcanic basalt Spider jasper botryoidal forms

botryoidal forms

and other igneous minerals

While commonly called red chalcedony

The red and black crystals are mostly matte but there is some glitter to the druzy

The layers turn into streaky green chlorite at the base

San Carlos peridotite with chrome diopside and spinel in volcanic basalt Spider jasper botryoidal formsLocale: San Carlos Apache Reservation, Arizona Approx dimensions: 3 x 2 x 1" Approx weight: 212g While this material is commonly called peridot in (or on) basalt, it is actually more complex. It would be more accurately called a peridotite xenolith in basalt. Peridot is the gem quality version of the mineral olivine, which is common in our Earths upper mantleand even in space. In comparison, peridotite is a combination of several types of minerals