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Description
San Carlos peridotite in volcanic basalt, smallLocale: San Carlos Apache Reservation, Arizona Approx size: 22. 75" Approx weight: 100200g 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 that
Locale: San Carlos Apache Reservation, Arizona
Approx size: 2–2.75"
Approx weight: 100–200g
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 Earth’s upper mantle—and even in space. In comparison, peridotite is a combination of several types of minerals that primarily features olivine, but can also contain spinel, garnet, diopside, and other igneous minerals. This high-quality material from San Carlos, Arizona, has peridotite containing olivine (light yellow-green), chrome diopside (vivid green), and spinel (deep forest green), creating beautiful tones.
Xenolith means there are pockets of ‘foreign’ material, peridotite, included within the igneous rock, basalt. This is what's called vesicular basalt, referring to the classic 'volcanic rock' style of basalt full of cavities left behind by gas bubbles. The peridotite would have formed in the upper mantle but pieces of it became entrapped in magma during the eruption that transported it to the earth’s surface.
** Brittle warning! This material has the tendency to be crumbly, shedding pieces when handled. I find it to be a beautiful accent rock for my garden and do keep some pieces outdoors despite this risk. Just keep it out of direct sunlight and the elements!
🚨 ** ALERT!! This material may have been lightly treated with a spray; I swear I smell something! Vendors sometimes use hairspray to make minerals appear shiny, but in this case I suspect they might have used something like a fixative spray to help hold the small crumbly crystals in the peridotite pockets. I do not detect any altered appearance.
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