scapolite

[skap-uh-lahyt]
noun
1.
any of a group of minerals of variable composition, essentially silicates of aluminum, calcium, and sodium, occurring as massive aggregates or tetragonal crystals.
2.
the member of the scapolite group intermediate in composition between meionite and marialite; wernerite.

Origin:
1795–1805; < German Skapolith. See scape, -o-, -lite

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World English Dictionary
scapolite (ˈskæpəˌlaɪt)
 
n
Also called: wernerite any of a group of colourless, white, grey, or violet fluorescent minerals consisting of sodium or calcium aluminium silicate, carbonate, and chloride in tetragonal crystalline form. They occur mainly in impure limestones and pegmatites
 
[C19: from German Skapolith, from Greek skapos rod + -lite]

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Encyclopedia Britannica
Encyclopedia

scapolite

any of a group of feldspathoid minerals found in calcium-rich metamorphic rocks, particularly marble, gneiss, granulite, greenschist, and skarns. Principal occurrences are Quebec and Ontario, Canada; Kiruna, Swed.; Pennsylvania, United States; and Queensland, Australia. These minerals form a solid-solution (chemical-replacement) series in which sodium and calcium replace each other in the molecular structure. Marialite, a sodium aluminosilicate, and meionite, a calcium aluminosilicate, are the theoretical end-members (pure compounds); they have been synthesized but occur in nature only with at least 20 percent substitution of one for the other. Wernerite (the former group name) has been used for members of intermediate composition between marialite and meionite. For chemical formulae and detailed physical properties, see feldspathoid (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Late carbonate veins and replacements cut intrusive rocks and scapolite is a common alteration mineral in volcanic rocks.
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