Sandstone arch, small Arizona Sierra Peridotite This Erongo specimen features a

This Erongo specimen features a cluster of black tourmaline (schorl) between two chunky smoky quartz crystals

Microcline is a type of feldspar that forms opaque blocky geometric crystals

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

This is all to say

Sandstone arch, small Arizona Sierra Peridotite This Erongo specimen features aLocale: Arizona Approx size and weight 1 31 lb, variable by piece; dimensions at end These sandstone arches mimic the grand arches of Utahs national parks. They are made of Arizona Sierra sandstone sourced from central Arizona. Sandstone is a sedimentary rock composed of sand compacted and cemented together through geological processes, giving it a grainy texture. Sandstone with distinct layering like this is often called picture stone because the