Albitite

albitite

[′al·bə‚tīt]
(petrology)
A porphyritic dike rock that is coarse-grained and composed almost wholly of albite; common accessory minerals are muscovite, garnet, apatite, quartz, and opaque oxides.

Albitite

 

a veined crystal-granular mineral consisting mainly of albite, sometimes with an admixture of quartz, muscovite, garnet, and acmite. Albitite can take the form of hydrothermically metasomatic formations linked with alkaline intrusions (in the Khibiny Mountains), with iron-ore formations (in the Ukraine), with gold-ore diorites (in the Ural Mountains and in California), or with ultrabasic rocks (in the Urals).

References in periodicals archive ?
The lustrous, transparent crystals are floaters, or rest on green diopside or white albitite matrix.
The famous grossular garnets are found in fractures in red syenite and in the albitites and rodingites which are included in the dunite and peridotite.
In contrast, the Pinkneys Point granite was described as a more variable unit, containing topaz granite, greisenized granite, albitite, and greisen, and associated with mineralization, including cassiterite, wolframite, scheelite, and a variety of similar lithophile-element minerals (Chatterjee et al.
Extensive albitisation is seen along veins, as brecciation, as formation of foliated albititic felsites and chlorite schists, as carbonate-rich albitite, and as large-scale albitite bodies [23, 35].
Large bodies of albitite are found in the vicinity of Kragero and towards Arendal [23, 57-59].
Albite is the dominant mineral in foliated felsites, in chlorite schist, in carbonate-rich albitite, and in large-scale albitite bodies [23,50].
At the Langoy locality, albitite extends over a 3 x 2 km area and follows a mapped vein-pattern through gabbro, metagabbro, and scapolite metagabbro rocks (Figure 1(b)).
The albitite is clinopyroxene- and titanite-bearing.
Quantitative study ofthe project area reveals that the rock types ofthe aggregate encountered in the field study are 40.44% sedimentary rocks including limestone, sandstones and dolomitic chert, 25.55% metamorphic rocks including schists, gneisses, marbles, slates and epidosite and 34.01% igneous rocks including peridotite, dolerite, gabbro, granites albitite.
The constituent rocks majorly include alkali granites, syenites, nepheline syenites, carbonatites and albitites, all known as the major producers for REE bearing deposits.
Occurrence: In tugtupite-bearing albitites. Associated minerals are: aegirine, analcime, beryllite, bertrandite, chkalovite, epistolite, galena, manganoan pectolite, microcline, Na-komarovite, neptunite, pyrochlore, sphalerite and tugtupite.