schorl


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schorl

 (shôrl)
n.
Tourmaline, especially black tourmaline.

[German Schörl.]

schor·la′ceous (shôr-lā′shəs) adj.

schorl

(ʃɔːl)
n
(Minerals) a black tourmaline consisting of a borosilicate of sodium, iron, and aluminium. Formula: NaFe3B3Al3(Al3Si6O27)(OH)4
[C18: from German Schörl, origin unknown]
schorˈlaceous adj
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.schorl - black tourmaline
tourmaline - a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones
References in periodicals archive ?
Gesner Id and Number Gesner Location Schorl GN1075 Connick's Mills, Waewig River Novaculite or Hone Campobello Slate GN 1253 Fossil Corallines Digdeguash River GN1363.
A iniciacao sexual e sexualidade de jovens em geral vem sendo investigadas a partir de um recorte de genero por inumeros autores, a exemplo de Borges e Schorl, (1,2), Feliciano (3), Heilborn (4) Leal e Knaut (5), Melo e Santana (6) e Rieth (7).
When in association with beryl and/or emerald, the tourmaline is dravite to uvite, otherwise it is schorl.
When we get to "The Nesosilicate Subclass" we find, within it, about 20 pages on Imperial topaz and the history of its extraction at Ouro Preto; when we come to "The Cyclosilicate Subclass" we find 12 pages (3 short chapters) on emeralds, 30 pages (two chapters) on other colored beryls, and an extraordinary 100 pages on tourmalines, including individual chapters on, for example, the Cruzeiro mine, the Pederneira mine, the Santa Rosa mine, the Jonas mine, the Golconda district, northeastern Brazilian tourmaline-bearing pegmatites, and miscellaneous occurrences of uvite, dravite and schorl.
In the older classifications they were considered typical sodalithic pegmatites, with characteristic dominance of albite over microcline, lepidolite over other micas, spessartine over almandine and elbaite over schorl.
Grayish pale violet, just barely translucent and not highly lustrous, shot through with black acicular crystals of schorl, they are not much to look at, unfortunately, but they are apparently the only herderite crystals yet to see daylight.
Some exquisite specimens show sharp, complete fluorite octahedrons impaled by black, sleek, needle-like crystals of schorl (Gramaccioli, 1975).
Schorl is common within the quartz lenses, occurring as thin, elongate black crystals with high luster.
The gorgeously sharp, gemmy, medium-blue crystals of aquamarine to 12 cm stand up at all angles from clusters of blocky, glossy black schorl crystals and chalky white, partially corroded (but still quite clean-looking) K-feldspar crystals.
The pegmatite is zoned: the contact zone consists of fine-grained microcline, dark muscovite, quartz and scarce, fine-grained schorl; the intermediate zone contains larger microcline crystals, coarse quartz, albite, gray muscovite plates and small to medium-size schorl crystals with scarce grains of green apatite.
The pegmatite is hosted in gray gneiss and consists of albite, cleavelandite, quartz, muscovite, beryl, schorl and columbite-tantalite.
Schorl Tourmaline with Spessartine Shigar Valley, Skardu, Gilgit, Pakistan 5" tall ex-collection Matthew Webb