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 metamorphic grade of the greenstone ranges from greenschist to lower-to-middle amphibolite facies and increases towards greenstone-gneiss contacts, possibly indicating the greenstone units were structurally emplaced along thrust faults that later focussed gold ore-forming hydrothermal activity and closely associated granitic and albitite intrusions.
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.
Subsequent holes will test the Albitite and Arsenopyrite Zones further down plunge to the west.
The fall-2012/winter-2013 diamond drilling program consisted of 18 holes totaling 6,686 m aimed at testing the down-dip extension of the Albitite Zone and untested geophysical and geological targets elsewhere on the property.
At present, two drills are in operation, drilling the downward and western projection of the Hydrothermal, Arsenopyrite and Albitite Zones.
The 2012/2013 diamond drilling program consisted of 18 holes totalling 6,686 m and had two objectives: first, to test the down-dip extension of the Albitite Zone and, second, to explore untested geophysical and geological targets elsewhere on the property.
Drilling will follow up on promising recent results and will test undrilled areas east of and below the known Albitite Zone.
No significant gold values were recorded from the pyritic albitite and Caledonia has concluded that the potential for an open-pit operation as previously envisaged is not economically viable.
In summary, drilling results from holes CF96-2 and CF96-3 are encouraging, encountering massive sulphide veins, abundantly disseminated sphalerite and galena at "Sullivan Time", black and brown tourmalinite, bedded fragmental, albitite, cross-cutting fragmental, and intensely disrupted sediments adjacent to and below the Fors massive sulphide Pb-Zn-Ag deposit and outlining an area of at least 1km x 400m.
In summary, drilling results from holes CF96-2 and CF96-3 are encouraging, encountering massive pyrrhotite veins, abundantly disseminated sphalerite and galena at "Sullivan Time", black and brown tourmalinite, bedded fragmental, albitite, cross-cutting fragmental, and intensely disrupted sediments adjacent to and below the Fors massive sulphide Pb-Zn-Ag deposit and outlining an area of at least 1km x 400m.
Jadeitites, albitites and related rocks from the Motagua Fault Zone, Guatemala, Journal of Metamorphic Geology 12: 49-68.