albite

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  • noun

Synonyms for albite

a widely distributed feldspar that forms rocks

References in periodicals archive ?
Petrography and mineral chemistry of the metasomatic rocks have been described in detail by Engvik et al.: albitisation of granitoid [35], scapolite metagabbro and vein-related albitisation of mafic rock [20, 29], albite-carbonate-rich deposits and albitic felsites [23], and scapolite metagabbro, clinopyroxene-bearing albitite, and rutile-albitite [50].
However, experimental work by London and Evensen (2002) has indicated mechanisms whereby Be can be scavenged and therefore depleted from the melt by specific mineral phases, including: (1) plagioclase; Be contents peak in plagioclase composition [An.sub.30] (oligo-clase-andesine) such that a magma crystallizing this composition of plagioclase will not increase in Be content until more albitic plagioclase crystallizes; (2) white mica; Be can enter the mica structure, therefore intrusions containing white mica potentially have higher Be contents, and are less capable of producing subsequent high-Be melts; and (3) cordierite; it can incorporate a large amount of Be and garnet cannot; therefore, late magmas associated with garnet-bearing intrusions are potentially more Be-rich.
One of these is made up of medium/fine-grained xenomorphic assemblage comprising epidote chlorite titanite quartz and albitic plagioclase.
The Nb/Y ratios range between 0.44-1.89 (Table 2) indicating an alkaline affinity, in agreement with the orthose enrichment of the most albitic plagioclase (Fig.
Feldspar separates consisted of alkali feldspar, either albitic plagioclase or potassium feldspar, or mixtures of both.
It is a medium grained orthogneiss with a cataclastic fabric that apparently developed after an earlier fabric of granoblastic character, and consists of quartz, albitic plagioclase, biotite, chlorite, sericite, epidote-clinozoisite, ilmenite, pyrite, apatite and zircon.
These zones of secondary albite, previously been referred to as albitic aplite (Hutchinson 1982; Hughes 1995), are locally pervasive and such areas are preferentially enriched in Ta-Nb and phosphate minerals (Kontak 2004).
Perthitic texture is typically present, and albitic lamellae have compositions similar to those of separate plagioclase grains in the rock.
Plagioclase is albitic in most samples and relict clinopyroxene is normally preserved.