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Felsic. In geology, felsic is a modifier describing igneous rocks that are relatively rich in elements that form feldspar and quartz. [1] It is contrasted with mafic rocks, which are relatively richer in magnesium and iron. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen ...
Lepidolite. Pink, light purple, purple, rose-red, violet-gray, yellowish, white, colorless other colors possible but are rare. Lepidolite is a lilac -gray or rose-colored member of the mica group of minerals with chemical formula K (Li,Al)3(Al,Si,Rb)4O10(F,OH)2. [2][3] It is the most abundant lithium -bearing mineral [4] and is a secondary ...
Kaolinite (/ ˈ k eɪ. ə l ə ˌ n aɪ t,-l ɪ-/ KAY-ə-lə-nyte, -lih-; also called kaolin) [5] [6] [7] is a clay mineral, with the chemical composition: Al 2 Si 2 O 5 4.It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6).
Felsite is a very fine-grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light-colored rock that typically requires petrographic examination or chemical analysis for more precise definition. Color is generally white through light gray, or red to tan and may include any color except dark gray, green ...
November 2002; 21 years ago. ( 2002-11) The Vietnamese Wikipedia ( Vietnamese: Wikipedia tiếng Việt) is the Vietnamese-language edition of Wikipedia, a free, publicly editable, online encyclopedia supported by the Wikimedia Foundation. Like the rest of Wikipedia, its content is created and accessed using the MediaWiki wiki software.
Battle of Dien Bien Phu. The Battle of Điện Biên Phủ was a climactic confrontation of the First Indochina War that took place between 13 March and 7 May 1954. It was fought between the French Union 's colonial Far East Expeditionary Corps and Viet Minh communist revolutionaries.
Location of Imperial City of Huế in Vietnam. The Imperial City (Vietnamese: Hoàng thành; chữ Hán: 皇城) is a walled enclosure within the citadel (Kinh thành; chữ Hán: 京城) of the city of Huế, the former imperial capital of Vietnam during the Nguyễn dynasty. It contains the palaces that housed the imperial family, as well as ...
Archean felsic volcanic rocks are felsic volcanic rocks that were formed in the Archean Eon (4 to 2.5 billion years ago). [2] The term "felsic" means that the rocks have silica content of 62–78%. [3] Given that the Earth formed at ~4.5 billion year ago, [4] Archean felsic volcanic rocks provide clues on the Earth's first volcanic activities ...