A light coloured alkali-feldspar-granite consisting almost entirely of quartz and alkali feldspar and with M' colour index less than 10. In the United States, a commonly used term for a granitic rock containing few, if any, dark minerals.

Leucogranite is a light-colored, granitic, igneous rock containing almost no dark minerals. Leucogranites have been reported from a variety of orogenies involving continental collisions.

The meaning of ALASKITE is a leucocratic granite of medium or fine grain composed chiefly of quartz and alkali feldspars.

2006年3月28日 · Light-tan to pink fine- to medium-grained bodies of alaskite are found on Hagan Mountain north of Berdeen Lake and on the north side of Bear Creek (fig. 15A). The alaskite is composed of 30-40 percent perthite, 20-35 percent sodic andesine, and 25-35 percent quartz.

Alaskite is a light-colored, coarse-grained, granitic rock primarily composed of quartz and alkali feldspar, with very little or no plagioclase feldspar. Due to its mineral composition, alaskite is often classified as leucogranite.

Alaskite gneiss of the Hope Valley is mainly pink or light tan, but also gray, medium-grained, and lineated with aggregates of smoky quartz. Distinguished from the Potter Hill by its low biotite content.

2025年3月12日 · Name Spruce Pine alaskite introduced in this report for extremely coarse-textured granite that outcrops around the town of Spruce Pine in Mitchell Co. and in smaller areas in Brushy Creek and Ingalls sections of Avery Co., NC.

The structure of alaskite is crystalline and grainy, less often porphyritic, and its color is oxblood red, rose, white, or light gray. The term derives from the name of the Alaskan Peninsula, where the mineral was first observed. It is associated with rare-metal and rare-earth deposits.

Biotite and hornblende representing the commonest mafic minerals. If M < 10% the rock can be named alaskite (i.e. a leucocratic variety of alkali feldspar granite).

Examination of the relationships between textural variations and structural features in a complex, leucocratic dike swarm that is enclosed in the Half Dome quartz monzonite of the Sierra Nevada batholith led to the conclusion that alaskites, aplites, and pegmatites were produced by a continuous process, in which the degree of saturation of the d...