San Carlos peridotite with chrome diopside and spinel in volcanic basalt Fossil Colorless hyalite coats parts of

Colorless hyalite coats parts of the albite

best viewed in dark conditions with a strong 365nm UV light

The specimen also has an interesting snowball of small colorless needles atop the hyalite

In Atlas Mountain Jasper

and is very bright when exposed to a powerful 365nm UV light

San Carlos peridotite with chrome diopside and spinel in volcanic basalt Fossil Colorless hyalite coats parts ofLocale: San Carlos Apache Reservation, Arizona Approx dimensions: 3 x 2. 5 x 2" Approx weight: 260g 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