a mineral, intermediate in the plagioclase feldspar group, having a play of colors and usually found as crystals in igneous rocks.
These intermediate members are the lime-soda felspars known as oligoclase, andesine, labradorite and bytownite.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 Various
a feldspar mineral of the plagioclase series consisting of an aluminium silicate of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8
A white, gray, green or yellow mineral of the plagioclase feldspar group. Andesine occurs in igneous rocks such as andesite and diorite. Chemical formula: (Na,Ca)(Si,Al)4O8.
a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite. Historical Examples M. Dubois discovered these remains in the island of Java in andesite tufa of Pliocene or at least early Pleistocene age. The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard Surface eruption of […]
a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite. Historical Examples It is composed of andesitic lavas of the augite type, is pierced by many fumaroles, and has a crater in the solfatara stage. The Solomon Islands and Their Natives H. B. (Henry Brougham) Guppy […]
andf Architecture Neutral Distribution Format
- Andhra pradesh
a state in SE India, formed from portions of Madras and Hyderabad states 1956. 105,963 sq. mi. (274,444 sq. km). Capital: Hyderabad. Contemporary Examples Andhra Pradesh has 42 parliamentary constituencies; 33 of these elected Congress candidates in the previous election. India’s Newest State Telangana Is Bosnia Redux Kranti Rai March 21, 2014 Andhra Pradesh, stretching […]