Amphibole - Wikipedia
Amphibole (/ ˈ æ m f ə b oʊ l / AM-fə-bohl) is a group of inosilicate minerals, forming prism or needlelike crystals, [1] composed of double chain SiO 4 tetrahedra , linked at the vertices and generally containing ions of iron and/or magnesium in their structures.
Amphibole | Structure, Composition & Uses | Britannica
The essential characteristic of the amphibole structure is a double chain of corner-linked silicon-oxygen tetrahedrons that extend indefinitely parallel to the c crystallographic axis, the direction of elongation (Figure 2). The tetrahedrons alternately share two and three oxygen atoms to produce a silicon-to-oxygen ratio of 4:11.
(PDF) The crystal chemistry of the amphiboles - ResearchGate
1983年5月2日 · It is shown that amphiboles belong to five principal structure-types, with space groups C2/m, P2/a, P2//1/m, Pnma, and Pnmn, but the C2/m and Pnma structures are by far the most common.
角闪石 | Zicong Xiao - 中国科学技术大学
2022年8月8日 · There are 5 major groups of amphibole leading to 76 chemically defined end-member amphibole compositions according to the British mineralogist Bernard E. Leake. Because of the wide range of...
Amphiboles - ALEX STREKEISEN
There are 5 major groups of amphiboles leading to 76 chemically defined end-member amphibole compositions according to the British mineralogist Bernard E. Leake. Because of the wide range of chemical substitutions permissible in the crystal structure, amphiboles can crystallize in igneous and metamorphic rocks with a wide range of bulk chemistries.
(PDF) Amphiboles: Crystal Chemistry - ResearchGate
2007年6月1日 · The amphibole structure consists of two principal elements, a double chain of corner- sharing tetrahedra and a strip of edge-sharing octahedra, both of which extend in the c -direction
The amphibole structure consists of double chains of tetrahedra parallel to the c-axis. The chains are arranged such that the characteristic amphibole cleavage is 56° –124° (see your lecture notes).
The amphibole structure is characterized by chains of tetrahedrally coordinated cations, crosslinked to form paired polymers of infinite length parallel to the c crystallographic axis. The basic building blocks, the tetrahedra, share alternately two and three oxygens between consecutive tetrahedrally coordinated cations in the chain.
(PDF) Crystal Chemistry of the Amphiboles - ResearchGate
1981年6月8日 · Two crystallographically independent OH groups hosted by the oxygen atoms at O3A and O3B, in Pnma amphi-boles, show two OH-stretching bands having approximately equal intensity (Hawthorne, 1983)....
Amphibole | Common Minerals
An important group of rock-forming minerals in igneous and metamorphic rocks, amphiboles share a similar crystal structure and cleavage pattern, but contain different proportions of sodium (Na), calcium (Ca), iron (Fe) and magnesium (Mg), which substitute for one another in …