San Carlos peridotite with chrome diopside and spinel in volcanic basalt Spider jasper The layers turn into streaky

The layers turn into streaky green chlorite at the base

and other igneous minerals

Approx weight: 515g (1

botryoidal forms

This specimen displays the dual-tone fluorescence especially well

San Carlos peridotite with chrome diopside and spinel in volcanic basalt Spider jasper The layers turn into streakyLocale: 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