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Автор: Jesse Russel
Год: 2012
Издание:
Книга по Требованию
Страниц: 100
ISBN: 9785511302744
High Quality Content by WIKIPEDIA articles! Zircon (pronounced /?z?rk?n/; including hyacinth or yellow zircon) is a mineral belonging to the group of nesosilicates. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4. A common empirical formula showing some of the range of substitution in zircon is (Zr1–y, REEy)(SiO4)1–x(OH)4x–y. Zircon forms in silicate melts with concentrated incompatible elements and accepts high field strength elements into its structure. For example, hafnium is almost always present in quantities ranging from 1 to 4%. The crystal structure of zircon is tetragonal crystal system. The natural color of zircon varies between colorless, yellow-golden, red, brown, blue, and green. Colorless specimens that show gem quality are a popular substitute for diamond; these specimens are also known as "Matura diamond". Данное издание представляет собой компиляцию сведений, находящихся в свободном доступе в среде Интернет в целом, и в...
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