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In 1885–86, the 10th Cavalry, an African-American enlisted unit commanded by white officers, established a temporary camp at Bonita Canyon. They were part of the last campaign to capture the Apache rebel Geronimo. In 1886 Neil Erickson and Emma Sophia Peterson, both young Swedish immigrants, married and set out for Bonita Canyon to homestead ...
Fluorine is a relatively new element in human applications. In ancient times, only minor uses of fluorine-containing minerals existed. The industrial use of fluorite, fluorine's source mineral, was first described by early scientist Georgius Agricola in the 16th century, in the context of smelting. The name "fluorite" (and later "fluorine ...
Fluorite (CaF 2), also called fluorspar, is the main source of commercial fluorine. Fluorite is a colorful mineral associated with hydrothermal deposits. It is common and found worldwide. China supplies more than half of the world's demand and Mexico is the second-largest producer in the world. [citation needed] The United States produced most ...
Bonita Canyon is a box canyon on the western slope of the Chiricahua Mountains in southeastern Arizona, which lies at 5,360 feet (1,630 m) in elevation and opens in a southwesterly direction into the Sulphur Springs Valley. [2] The canyon walls are capped with outcroppings of volcanic tuff and separated by a narrow valley about a quarter of a ...
Maurice Meslans. Signature. Ferdinand Frédéric Henri Moissan (28 September 1852 – 20 February 1907) was a French chemist and pharmacist who won the 1906 Nobel Prize in Chemistry for his work in isolating fluorine from its compounds. [a] Moissan was one of the original members of the International Atomic Weights Committee. [1][3]
Fluorine is a chemical element; it has symbol F and atomic number 9. It is the lightest halogen [note 1] and exists at standard conditions as pale yellow diatomic gas. Fluorine is extremely reactive as it reacts with all other elements except for the light inert gases. It is highly toxic.
Chiricahua National Monument is a unit of the National Park System located in the Chiricahua Mountains of southeastern Arizona. The monument was established on April 18, 1924, to protect its extensive hoodoos and balancing rocks. The Faraway Ranch, which was owned at one time by Swedish immigrants Neil and Emma Erickson, is also preserved ...
Anna Sofaer. Anna Sofaer (born November 20, 1940) is an American researcher and educator on the archaeoastronomy of the Ancestral Puebloans of the American Southwest and other ancient cultures. In 1977, she "rediscovered" the astronomical marker site known as the Sun Dagger on Fajada Butte in Chaco Culture National Historical Park.