Occurs in pegmatites and high-temperature quartz veins, also in cavities in granites and rhyolites. A maximum of ~30 % of the F site is occupied by OH in natural topaz, although in some very rare cases OH-dominant members have been described in high-pressure rocks, see
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Named "corinvindum" in 1725 by John Woodward and derived from the Sanskrit, kuruvinda ("Ruby"). Richard Kirwan used the current spelling "corundum" in 1794.
An ore deposit is an accumulation of ore. This is distinct from a mineral resource as defined by the mineral resource classification criteria.
the documents. may september 1953. 1. internal colonial office memorandum on availability of forces to prevent disturbances in british guiana
This list of museums in Virginia, United States, contains museums which are defined for this context as institutions (including nonprofit organizations, government entities, and private businesses) that collect and care for objects of cultural, artistic, scientific, or historical interest and make their collections or related exhibits available ...
Tantalite WikipediaTantalite occurs in granitic pegmatites that are rich in rare-earth elements, and in placer deposits derived from such rocks. It has been found in Australia, Brazil, Canada,
How Tantalum Is Mined | eHowHow Tantalum Is Mined. Tantalum is a grey, heavy and very hard metal with a melting point of over 3000 degrees Celsius. It is classified as a "refractory"
Geopolítica de los minerales estratégicos: La La avaricia, el irrespeto a la naturaleza, el consumismo estimulado (obsolescencia programada y obsolescencia percibida), el materialismo
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