San Carlos peridotite with chrome diopside and spinel in volcanic basalt Spider jasper Petrified wood is a form

Petrified wood is a form of fossilized wood where the organic material has been replaced with minerals

An irregular-shaped piece of matrix is covered in glittering red calcite druzy on both sides

If pyrite is fool's gold

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

botryoidal forms

San Carlos peridotite with chrome diopside and spinel in volcanic basalt Spider jasper Petrified wood is a formLocale: 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