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It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions.
The racial makeup of the town was 94.5% White, 0.2% Black or African American, 1.2% Native American, 0.3% Asian, 0.1% Pacific Islander, 2.6% from other races, and 1.2% from two or more races. 5.0% of the population were Hispanic or Latino of any race.
Glaciation of the southern hemisphere raised and lowered sea levels in Arizona, creating the ledge and slope topography common in the Grand Canyon, Sedona and Monument Valley, with alternating layers of siltstone, limestone, sandstone, dolomite and shale. The Kaibab Limestone is a famous formation from this time, covering much of northern ...
The name of the park gives it away: Most of the fossils you'll see at Petrified Forest are of exquisite petrified wood from the Triassic period over 200 million years ago.
The Aztec Sandstone is made up of two units. The lower resistant sandstone unit (100 metres (330 ft) thick) is tan to off-white in outcrops but pinkish in fresh exposures. Cross-bedded lenses can easily be observed. Frosted and pitted quartz grains well-cemented by silica are described by Evans in 1958 and 1971.
"Gold Atlas of Quartzsite, Arizona Volume 2 Southern Dome Rock Mountains"; by: Dr. Erik Melchiorre; ISBN 978-0981763149. "Arizona – Quartzsite Area: Things you may NOT have seen in and around Quartzsite, AZ."; by Joe Lange (Author, Photographer) and Dorothy "Tootie" Jacobs (Contributor); Publisher: CreateSpace ISBN 978-1450541312.
Almost 12 years ago, a pilot flying a small plane over the desert in Arizona spotted something she would never forget. Pez Owen told NPR that when she noticed white crosses on the ground, she and ...
Araucarioxylon arizonicum (alternatively Agathoxylon arizonicum) is an extinct species of conifer that is the state fossil of Arizona. [1] The species is known from massive tree trunks that weather out of the Chinle Formation in desert badlands of northern Arizona and adjacent New Mexico, most notably in the 378.51 square kilometres (93,530 acres) Petrified Forest National Park. [2]