Accessory Minerals

Accessory Minerals

Accessory mineral |

Accessory minerals characteristically are formed during the solidification of the rocks from the magma; in contrast are secondary minerals, which form at a later time through processes such as weathering by hydrothermal alteration. Common minor accessory minerals include topaz, zircon, corundum, fluorite, garnet, monazite, rutile, magnetite, ilmenite, allanite, and tourmaline.

Accessory minerals - definition of accessory minerals by ...

Biotite and hornblende are main accessory minerals. Rare earth elements in ultramafic and mafic rocks and their minerals; minor and accessory minerals. The groundmass is composed of quartz, feldspar, devitrified glass, minor magnetite, ilmenite, pyrite, rare galena, fluorite and accessory minerals similar to those in trachyte samples (i.

accessory mineral |

accessory mineral A mineral phase within a rock whose presence does not affect the root name of the rock. For instance, the root name ‘granite’ is defined by the presence of quartz, alkali feldspar, and mica. These are the ‘essential minerals’.

Accessory Mineral - an overview | ScienceDirect Topics

Accessory minerals commonly contain high concentrations of radioactive elements, and are a common target of radiogenic isotope measurements. Specific elements include uranium (zircon, apatite, titanite, monazite, xenotime, allanite) and thorium (monazite and allanite).

Accessory (silicates) Oxide Minerals

Accessory (silicates) and Oxide Minerals Common accessory and metal oxide species are often valuable ore minerals or important phases for petrographic interpretation. An accessory mineral <1 % of a rock by volume An ore mineral The occurrence of a mineral …

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