accessory mineral


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accessory mineral

[ak′ses·ə·rē ‚min·rəl]
(mineralogy)
A minor mineral in an igneous rock that does not affect its general character.
References in periodicals archive ?
In accordance with these observations, a variable proportion of interstitial minerals, including clinopyroxene, [H.sub.2]O-bearing phases (amphibole, phlogopite) and other accessory minerals (e.g.
Epidote occurs as an accessory mineral. Their protolith corresponds to fine- to mediumgrained pelitic sediments, which were affected by a metamorphism reaching the amphibolite facies.
We suggest that the reason for this lies in the physical effect of hydraulic sorting on coarser REE-bearing accessory minerals which have been left behind during fluvial transport of these river gravels.
The use of epigenetic interlayer solution of some accessory minerals for establishing the time of formation of oil deposits // Epigenesis and its mineral indicators / A.
Accessory minerals are andalusite, zircon, apatite, ilmenite, xenotime, monazite, rare sphene and garnet.
Magnetite, apatite, and pyrite are prominent accessory minerals.
Fluorapatite, zircon, Nb-Ta-Ti oxides, xenotime-(Y), monazite-(Ce), uraninite and coffinite are common accessory minerals. Cassiterite occurs as a very rare accessory mineral.
Zircon occurs as the main accessory mineral. Tourmaline, fluorite and rutile occur occasionally.
Insights should come from materials in the rocks that existed over the longest part of the pluton's history, and potential candidates include the complex K-feldspar megacrysts, the early accessory mineral assemblage, and the mafic microgranular enclaves.
In uranium productive granites, uranium is mostly present as accessory mineral. The granites with uranium locked in the lattice structure of minerals do not hold many chances for producing any considerable uranium deposits.
Actinolite is a rare accessory mineral in skarns throughout the district, especially in the Bor pit.
Botryoidal native arsenic is found rarely as an accessory mineral to the late sulfide vein assemblage.

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