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Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...
Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]
During the Medieval Ages, European lapidaries came to refer to blue corundum crystal by "sapphire", a derivative of the Latin word for blue: sapphirus. [74] The sapphire is the traditional gift for a 45th wedding anniversary. [75] A sapphire jubilee occurs after 65 years.
Sapphire is a saturated shade of blue, referring to the gemstone of the same name. Sapphire gems most commonly occur in a range of blue shades , although they can come in many different colors. Other names for variations of the color sapphire are blue sapphire or sapphire blue , shown below.
Quartzite can have a grainy, glassy, sandpaper-like surface. Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. [1] [2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
Robinsons Cyberscape is an office development located in Ortigas Center within Pasig City, Metro Manila.Owned by Robinson Land Corporation, the development was initially composed of Robinsons Cyberscape Alpha (Tower One) and Robinsons Cyberscape Beta (Tower Two) [1] [2] with a total of 80,000 square meters (861,112.83 square feet) of additional leasable space in the Ortigas CBD upon its ...
Name Type [a] Location Year established Year granted university status [b] Regulation status [c]; Batanes State College: SUC Main Basco, Batanes not applicable
Lopez Holdings Corporation (formerly primarily as Benpres Holdings Corporation from June 8, 1993 to July 21, 2010 and secondarily from July 21, 2010 to 2019, and also known as Lopez, Inc.) is a Filipino conglomerate founded by the brothers Eugenio Lopez, Sr. and Fernando Lopez, Sr.