Sandstone arch, large Arizona Sierra Selenite The exterior displays ropy ramen-like

The exterior displays ropy ramen-like growth patterns indicative of volcanic origins

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

Stromatolites in fact are still living and forming in some parts of our world today

These arches are originally created by drilling a hole through a chunk of sandstone and sandblasting the material into a smoothed arch

The alternating zones of green and purple muddle to give the material its distinctive inky grape-soda appearance

Sandstone arch, large Arizona Sierra Selenite The exterior displays ropy ramen-likeLocale: Arizona Approx size and weight 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 layers