amphibole

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am·phi·bole

 (ăm′fə-bōl′)
n.
Any of a large group of structurally similar silicate minerals, such as hornblende, that have a crystalline structure consisting of a double chain of linked SiO4 units and that contain various combinations of sodium, calcium, magnesium, iron, and aluminum. Several varieties of asbestos are fibrous forms of amphiboles.

[French, from Late Latin amphibolus, ambiguous, from Greek amphibolos, doubtful, from amphiballein, to throw on either side : amphi-, amphi- + ballein, to throw; see gwelə- in Indo-European roots.]

am′phi·bol′ic (-bŏl′ĭk) adj.

amphibole

(ˈæmfɪˌbəʊl)
n
(Minerals) any of a large group of minerals consisting of the silicates of calcium, iron, magnesium, sodium, and aluminium, usually in the form of long slender dark-coloured crystals. Members of the group, including hornblende, actinolite, and tremolite, are common constituents of igneous rocks
[C17: from French, from Greek amphibolos uncertain; so called from the large number of varieties in the group]

am•phi•bole

(ˈæm fəˌboʊl)

n.
any of a complex group of hydrous silicate minerals, containing chiefly calcium, magnesium, sodium, iron, and aluminum, and including hornblende, tremolite, asbestos, etc., occurring as important constituents of many rocks.
[1600–10; < French < Late Latin amphibolus < Greek amphíbolos thrown on both sides, ambiguous =amphi- amphi- + -bolos, derivative of bállein to throw]

am·phi·bole

(ăm′fə-bōl′)
Any of a large group of minerals composed of a silicate joined to various metals, such as calcium, magnesium, iron, or sodium. Hornblende is a mineral of the amphibole group.

amphibole

Any of a group of rock-forming ferromagnesian silicates.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.amphibole - a mineral or mineral variety belonging to the amphibole groupamphibole - a mineral or mineral variety belonging to the amphibole group
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
amphibole group - a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum
amphibolite - a metamorphic rock composed chiefly of amphibole and plagioclase
nephrite - an amphibole mineral consisting of calcium magnesium silicate in monoclinic crystalline form; a source of jade that is less valuable than from jadeite; once believed to cure kidney disorders
actinolite - a green mineral of the amphibole group; calcium magnesium iron silicate
anthophyllite - a dark brown mineral of the amphibole group; magnesium iron silicate
asbestos - a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer
hornblende - a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron
Translations
References in periodicals archive ?
Les plutons dioritiques a granodioritiques et la majorite des plutons granodioritiques is monzogranitiques forment des traces lineaires sur les schemas de diversite de la composition chimique, ce qui laisse supposer que l'evolution magmatique a dominee par une cristallisation fractionnee des plagioclases et des amphiboles.
Black explained that "We know from Australia that SMRP co-relates with proven cases of mesothelioma from Crocidolite amphiboles.
Most of the feldspars and amphiboles show evidences of thermodynamic and compositional disequilibrium with the melt.
Potency differences between chrysotile and amphiboles have received much attention in risk assessments for asbestos and may explain heterogeneity in exposure-response estimates between studies (Berman and Crump 2008a; Hodgson and Darnton 2000; Mossman et al.
The association with serpentines was stronger than with amphiboles.
The tremolite asbestos and other amphiboles in the Oak Ridge area do occur naturally in veins, safe within the earth.
Further, he noted that deformed dykes containing amphibole with strongly preferred orientation belonged to well-equilibrated metamorphic assemblages, whereas more massive varieties with randomly oriented amphiboles were not completely recrystallized to peak metamorphic conditions.
Primary Ti-rich amphiboles range from magnesio-hastingsite to magnesian hastingsitic hornblende (Leake 1978) and define a magmatic trend in which compositions become poorer in Al (total) and Ti at progressively higher values of (Fe+Mn)/(Fe+Mn+Mg).
Libby amphibole is a mixture of noncommercial amphiboles obtained from the vermiculite mine in Libby, Montana.
One investigator estimated that locally consumed products containing commercial asbestos types were broadly in the ratio of 70-80% chrysotile to 20-30% amphiboles (crocidolite or amosite) before 1996 (Tsin TW, personal communication).
1989) stated that calcium-rich amphiboles accounted for 15-30% of all asbestos fibers.