What is the indicator mineral of unsaturated silica in magma?
Silica is one of the most important rock forming components, it and other rock forming components with formation of olivine and pyroxene, hornblende, mica, feldspar and other minerals. These minerals in the formation of silica is still excess (i.e. supersaturation), so there will be quartz, quartz is igneous rocks indicated silica mineral saturation; if there may be insufficient silica content of olivine or feldspar minerals (such as nepheline). When silica and other rock group moderate content, it does not appear the two kinds of minerals, and the formation of pyroxene, amphibole and feldspar, silica saturated minerals.
A volcano rock formed in ancient times after the cooling of magma, in this volcano rock in addition to diamond, also known as containing two kinds of minerals of garnet and olivine. Therefore, in place of those produced in garnet and olivine, the possibility of finding a diamond mine on. Thus, garnet and olivine becomes looking for the "Diamond indicator minerals".
Under reduction condition of shallow water environment and sedimentation slow, can form a glauconite. Depth of ten m to two hundred and fifty m (temperate sea seawater temperature of fifteen degrees Celsius to thirty degrees) production. So called glauconite glauconitic depth indicator.
It is a marker for people to discover minerals that exist in certain environmental conditions
