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Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example, microscopic particles of silica called phytoliths can be found in grasses and other plants. Silica is an amorphous metalloid oxide formed by complex inorganic polymerization processes.
Opal occurs in significant quantity and variety in central Mexico, where mining and production first originated in the state of Querétaro. In this region the opal deposits are located mainly in the mountain ranges of three municipalities: Colón, Tequisquiapan, and Ezequiel Montes. During the 1960s through to the mid-1970s, the Querétaro ...
The Mexican Geological Survey originated as the Directing Committee for Mexican Mineral Resource Research, established in 1944, which published bulletins on the exploration of mineral deposits. In 1949, the organization changed its name to the National Research Institute for Mineral Resources, and in 1955 it became the Non-Renewable Natural ...
Deposits of moonstone occur in Armenia (mainly from Lake Sevan), Australia, the Austrian Alps, Mexico, Madagascar, Myanmar, Norway, Poland, India, Sri Lanka, and the United States. [2] [3] Historically, the most valuable, transparent moonstones with strong blue sheen came from Myanmar. [1] Today, most commercial moonstones come from Sri Lanka. [3]
Android phones, like this Nexus S running Replicant, allow installation of apps from the Play Store, F-Droid store or directly via APK files. This is a list of notable applications (apps) that run on the Android platform which meet guidelines for free software and open-source software.
Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los cristales) is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. It takes the form of a chamber within the limestone host rock of the mine, and is about 109 metres (358 ft) long with a volume of 5,000 to 6,000 cubic metres (180,000 ...
The 500-million download threshold for free applications has been established to maintain the list's manageability and focus on the most widely distributed apps. It's worth noting that many of the applications in this list are distributed pre-installed on top-selling Android devices [ 2 ] and may be considered bloatware by some people because ...
This form of the app store is often used by web developers to distribute apps that are not allowed in the Google Play Store; this may be due to an app allowing users wider access to the app system, or offering apps for "niche users" who choose to use only free and open-source software (F-Droid) or prefer to play indie games (Itch.io). Moreover ...