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Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide ( α- Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. The name sapphire is derived via the Latin "sapphirus" from the Greek "sappheiros", which referred to lapis lazuli. [2]

Cobbs Creek, Philadelphia. /  39.95028°N 75.24722°W  / 39.95028; -75.24722. Cobbs Creek is a neighborhood located in the West Philadelphia section of Philadelphia, Pennsylvania, United States, named for the creek which forms part of Philadelphia's western border. Cobbs Creek is generally bounded by Market Street to the north, Baltimore ...

The Philadelphia Lazaretto was the first quarantine hospital in the United States, built in 1799, in Tinicum Township, Delaware County, Pennsylvania. [3] The site was originally inhabited by the Lenni Lenape, and then the first Swedish settlers. Nearby Province Island was the site of the confinement of the Christian Moravian Indians who were ...

Girard Estate, also known as Girard Estates, is part of South Philadelphia.Its boundaries stretch from South 22nd Street on the west to South 17th Street on the east. The southern boundary is clearly defined as the south side of Shunk Street but its northern boundary is irregular in stretching from the north side of Porter Street between South 17th Street and South 21st Street, along east side ...

The green light is from the pump diode. Ti:sapphire lasers (also known as Ti:Al2O3 lasers, titanium-sapphire lasers, or Ti:sapphs) are tunable lasers which emit red and near-infrared light in the range from 650 to 1100 nanometers. These lasers are mainly used in scientific research because of their tunability and their ability to generate ...