Olivinitis
Olivinite is an igneous plutonic rock of ultrabasic composition , of a normal alkalinity series from the olivinite family. More than 90% consists of olivine with an admixture of magnetite , this differs olivinite from dunite , in which chromite is present instead of magnetite. A small amount in olivinite may contain impurities of pyroxenes ( clinopyroxene , orthopyroxene ), plagioclase , etc. The color of olive is dark gray, sometimes yellow, gray-green or brown.
The average chemical composition: SiO 2 35-41%, TiO 2 0.2-1.7%, Al 2 O 3 0.2-2%, Fe 2 O 3 4-10%, FeO 6-12%, MgO 37-48%, CaO 0.2 -2%, Na 2 O up to 0.5%, K 2 O up to 0.6%. [one]
Physical Properties
Density of olivinite 3.21 - 4.34 g / cm 3
Notes
- ↑ Petrographic Code of Russia. - St. Petersburg: VSEGEI, 2008 .-- S. 106. - 200 p. - 1,500 copies. - ISBN 978-5-93761-106-2
Links
- Olivinit // Great Soviet Encyclopedia : [in 30 vol.] / Ch. ed. A.M. Prokhorov . - 3rd ed. - M .: Soviet Encyclopedia, 1969-1978.
- The average mass content of oxides in%