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In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
The Peralta Stones are a set of engraved stones suppsedly indicating the location of the Lost Dutchman's Gold Mine, in Arizona, United States. The "Dutchman" was actually a German immigrant named Jacob Waltz (c. 1810–1891). [1] The story goes that the stones are named for an obscure "Peralta family", supposedly an old and powerful Mexican family.
Shattuckite is a relatively rare copper silicate mineral. It was first discovered in 1915 in the copper mines of Bisbee, Arizona, specifically the Shattuck Mine (hence the name). It is a secondary mineral that forms from the alteration of other secondary minerals.
Arizona flagstone is composed of rounded grains of quartz which are cemented by silica. Other minerals are present, mostly as thin seams of clay, mica , secondary calcite , and gypsum . Arizona flagstone is mainly quarried from the Coconino and Prescott National Forests .
Weavers Needle from Peralta Canyon. Weavers Needle is a 1,000-foot-high (300 m) column of rock that forms a distinctive peak visible for many miles around. Located in the Superstition Mountains east of Phoenix, Arizona, Weavers Needle was created when a thick layer of tuff (fused volcanic ash)—a volcanic plug [3] —was heavily eroded, creating the spire as an erosional remnant with a summit ...
Fire agate, a variety of chalcedony, is a semi-precious natural gemstone discovered so far only in certain areas of central and northern Mexico and the southwestern United States (New Mexico, Arizona and California). [1] Approximately 24-36 million years ago these areas were subjected to massive volcanic activity during the Tertiary Period.
Arizona is known as the Copper State because it produces two-thirds of US copper annually. Laramide copper porphyry deposits are common around Tucson and include the Twin Buttes, Sierrita-Esperanza, Rosemont, Silver Bell and Mission-Pima mines, as well as the historical Ajo mine to the west.
Banded white to blue green chrysocolla, from Bisbee, Arizona (size: 12.2 cm × 5.5 cm × 5.2 cm (4.8 in × 2.2 in × 2.0 in)) Chrysocolla and silver bolo tie . This chrysocolla specimen is from the Kennecot Copper Mine in Bingham Canyon , West Valley City, Utah .
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