accessory mineral


Also found in: Encyclopedia, Wikipedia.

accessory mineral

n.
A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.
Mentioned in ?
References in periodicals archive ?
The dominant rock type at Elsass is amphibolite with chalcopyrite - quartz +/- pyrrhotite accessory mineral assemblage.
Visual inspection of high-grade gold mineralization at Currans Find North has shown galena as a minor accessory mineral associated with Fe-sulphides.
[ClickPress, Mon Oct 29 2018] Characterized by acute hardness and unique shape, garnet is an extensively used accessory mineral across industries such as water jet cutting and abrasive blasting amongst others.
[USPRwire, Sun Oct 28 2018] Characterized by acute hardness and unique shape, garnet is an extensively used accessory mineral across industries such as water jet cutting and abrasive blasting amongst others.
11): 1) the distribution of most trace elements is controlled by minerals crystallised from the residual interstitial liquid (amphibole, phlogopite and other accessory phases), excepting the HREE, that are significantly incorporated in pyroxene (~30-50%), and Ba and LREE in plagioclase (~10-30%); 2) HREE are largely controlled by amphibole, 3) LILE are mainly incorporated into phlogopite (Rb, Ba) and plagioclase (Ba), 4) Nb-Ta demonstrate a clear preference for amphibole, phlogopite and one accessory mineral (likely ilmenite), and 5) many incompatible trace elements seem to be predominantly controlled by accessory phases present in modal proportion below 1 %: LREE (apatite) and Th-U and Zr-Hf (zircon and baddeleyite) (Fig.
Poitrasson F, Hanchar JM, Schaltegger U (2002) The current state and future of accessory mineral research.
Arsenopyrite is an abundant accessory mineral and is common in groups of sharply developed crystals.
Limited dissolution of slowly reacting accessory mineral phases during crustal melting (monazite, zircon, allanite), which host REE and HFS elements (Zr, Y, Nb, Ta, Hf, U, Th), will, moreover, produce depleted bulk-rock trace element patterns in melts if these melts separated from the residuum on timescales shorter than the dissolution rates (Watt and Harley 1993).
Sulfur is contained in pyrite, a common accessory mineral, particulary in the more mafic rocks of the suite.

Full browser ?