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- Variolite abstract "Variolites (Latin varius, "speckled, variegated") are a group of dark green basic igneous rocks that, especially on weathered surfaces, exhibit pale colored spots, or spherules, that give them a pockmarked appearance. In some conditions these spots weather out prominently; they are grey, pale green, violet or yellowish, while the matrix of the rock is usually dark green. The variolites are related most closely to the basalts or diabases. They are nearly always much decomposed, and, since they are also fine-grained rocks, their original composition may be much obscured by secondary changes. The variolitic spots are rounded in outline and are often about a quarter-inch in diameter, but may exceed this size. They have a radiate structure and are sometimes, though not generally, zoned with concentric circles of different appearance and composition. Many authors have compared them with the spherules of the acid rocks (obsidians and rhyolites), and undoubtedly some kinds of variolite are merely glassy spherulitic varieties of basalt. The tachylyte selvages of the dolerite dikes of the west of Scotland, for example, often contain large brown spherules that are easily visible in hand specimens. These spherulites consist of very thin divergent fibers, and their nature is often difficult to determine on account of the indefiniteness of the optical characteristics of minerals in this state. It seems probable, however, that they are mostly feldspar embedded in dark brown glass. Small phenocrysts or skeleton crystals of olivine, augite and plagioclase feldspar may occur in these tachylytes.".
- Variolite thumbnail Sample_of_Variolite,_Olympic_Peninsula,_Washington_USA.jpg?width=300.
- Variolite wikiPageID "1198809".
- Variolite wikiPageLength "5387".
- Variolite wikiPageOutDegree "44".
- Variolite wikiPageRevisionID "546107414".
- Variolite wikiPageWikiLink Acid.
- Variolite wikiPageWikiLink Amphibole.
- Variolite wikiPageWikiLink Augite.
- Variolite wikiPageWikiLink Basalt.
- Variolite wikiPageWikiLink Calcite.
- Variolite wikiPageWikiLink Category:Igneous_rocks.
- Variolite wikiPageWikiLink Chlorite_group.
- Variolite wikiPageWikiLink Cornwall.
- Variolite wikiPageWikiLink Devonian.
- Variolite wikiPageWikiLink Diabase.
- Variolite wikiPageWikiLink Dike_(geology).
- Variolite wikiPageWikiLink Dolerite.
- Variolite wikiPageWikiLink Eocene.
- Variolite wikiPageWikiLink Epidote.
- Variolite wikiPageWikiLink Feather.
- Variolite wikiPageWikiLink Feldspar.
- Variolite wikiPageWikiLink Felspathic.
- Variolite wikiPageWikiLink France.
- Variolite wikiPageWikiLink Germany.
- Variolite wikiPageWikiLink Igneous_rock.
- Variolite wikiPageWikiLink Intrusion.
- Variolite wikiPageWikiLink Intrusion_(geology).
- Variolite wikiPageWikiLink Ireland.
- Variolite wikiPageWikiLink Latin.
- Variolite wikiPageWikiLink Lava.
- Variolite wikiPageWikiLink Lava_flow.
- Variolite wikiPageWikiLink Leucoxene.
- Variolite wikiPageWikiLink Obsidian.
- Variolite wikiPageWikiLink Olivine.
- Variolite wikiPageWikiLink Olympic_Mountains.
- Variolite wikiPageWikiLink Olympic_Peninsula.
- Variolite wikiPageWikiLink Phenocryst.
- Variolite wikiPageWikiLink Pillow_lava.
- Variolite wikiPageWikiLink Plagioclase.
- Variolite wikiPageWikiLink Pyroxene.
- Variolite wikiPageWikiLink Rhyolite.
- Variolite wikiPageWikiLink Scotland.
- Variolite wikiPageWikiLink Spherule.
- Variolite wikiPageWikiLink Strait_of_Juan_de_Fuca.
- Variolite wikiPageWikiLink Swiss_Alps.
- Variolite wikiPageWikiLink Tachylite.
- Variolite wikiPageWikiLink Tachylyte.
- Variolite wikiPageWikiLink Wales.
- Variolite wikiPageWikiLink Washington_(U.S._state).
- Variolite wikiPageWikiLink Washington_(state).
- Variolite wikiPageWikiLink Weathering.
- Variolite wikiPageWikiLink File:Sample_of_Variolite,_Olympic_Peninsula,_Washington_USA.jpg.
- Variolite wikiPageWikiLinkText "Variolite".
- Variolite wikiPageWikiLinkText "Variolitic".
- Variolite wikiPageWikiLinkText "variolite".
- Variolite hasPhotoCollection Variolite.
- Variolite wikiPageUsesTemplate Template:1911.
- Variolite wikiPageUsesTemplate Template:No_footnotes.
- Variolite wikiPageUsesTemplate Template:One_source.
- Variolite subject Category:Igneous_rocks.
- Variolite hypernym Group.
- Variolite type Article.
- Variolite type Band.
- Variolite type Article.
- Variolite comment "Variolites (Latin varius, "speckled, variegated") are a group of dark green basic igneous rocks that, especially on weathered surfaces, exhibit pale colored spots, or spherules, that give them a pockmarked appearance. In some conditions these spots weather out prominently; they are grey, pale green, violet or yellowish, while the matrix of the rock is usually dark green. The variolites are related most closely to the basalts or diabases.".
- Variolite label "Variolite".
- Variolite sameAs Variolita.
- Variolite sameAs Variolite.
- Variolite sameAs m.04gmyh.
- Variolite sameAs Вариолит.
- Variolite sameAs Вариолит.
- Variolite sameAs Варіоліт.
- Variolite sameAs Q3131070.
- Variolite sameAs Q3131070.
- Variolite wasDerivedFrom Variolite?oldid=546107414.
- Variolite depiction Sample_of_Variolite,_Olympic_Peninsula,_Washington_USA.jpg.
- Variolite isPrimaryTopicOf Variolite.