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SINTER

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Originally appearing in Volume V25, Page 150 of the 1911 Encyclopedia Britannica.
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SINTER , a word taken from the See also:

German (allied to Eng. " cinder ") and applied to certain See also:mineral deposits, more or less porous or vesicular in texture. At least two kinds of sinter are recognized—one siliceous, the other calcareous. Siliceous sinter is a See also:deposit of opaline or amorphous See also:silica from hot springs and geysers, occurring as an incrustation around the springs, and sometimes forming conical mounds or terraces. The See also:pink and See also:white sinter-terraces of New See also:Zealand were destroyed by the eruption of See also:Mount Tarawera in 1886. Mr W. H. See also:Weed on studying the deposition of sinter in the Yellowstone See also:National See also:Park found that the colloidal silica was largely due to the See also:action of See also:algae and other forms of vegetation in the thermal See also:waters (gth See also:Ann. See also:Rep. U.S. Geol. Surv., 1889, p.

613). Siliceous sinter is known to mineralogists under such names as geyserite, fiorite and michaelite (see See also:

OPAL). Calcareous sinter is a deposit of See also:calcium carbonate, exemplified by the travertine, which forms the See also:principal See also:building See also:stone of See also:Rome (Ital. travertino, a corruption of tiburtino, the stone of See also:Tibur, now See also:Tivoli). The so-called " petrifying springs, " not uncommon in See also:limestone-districts, yield calcareous waters which deposit a sintery incrustation on See also:objects exposed to their action. The cavities in calcareous sinter are partly due to the decay of mosses and other See also:vegetable structures which have assisted in its precipitation. Even in thermal waters, like the hot springs of See also:Carlsbad, in Bohemia, which deposit Sprudelstein, the origin of the deposits is mainly due to organic agencies, as shown as far back as 1862 by Ferd. See also:Cohn. Whilst calcareous deposits in the open See also:air See also:form sinter-like travertine, those in caves constitute stalagmite. See also:Iron-sinter is a See also:term sometimes applied to cellular See also:bog iron-ore. (F. W.

End of Article: SINTER

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