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Encyclopedia Britannica



STRONTIANITE

This article appears in Volume V25, Page 1040 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: STE-SUS
STRONTIANITE , a
mineral
  consisting of strontium carbonate, SrCO3. It takes its name from Strontian in
Argyllshire
 , where it appears to have been known as far back as 1764, but it was not recognized as a distinct
mineral
  until later, when the examination of it led to the discovery of the
element
  strontium. It crystallizes in the orthorhombic system and is isomorphous with aragonite and witherite. Distinctly developed crystals are, however, of rare occurrence; they are usually acicular with acute pyramid-planes and are repeatedly twinned on the prism. Radiating, fibrous or granular aggregates are more common. The colour is white,
pale
  green or yellowish brown. The hardness is 31 and the specific gravity 3.7. Strontium is sometimes partly replaced by an equivalent amount of calcium. The mineral occurs in metalliferous veins in the lead mines of Strontian in
Argyllshire
 , Pateley Bridge in Yorkshire, Braunsdorf near Freiberg in Saxony; abundantly in veins in calcareous marl near Munster and Hamm in Westphalia; and in limestone at Schoharie in New
York
 . It is used for producing red fire in pyrotechny and for refining sugar. (L. J. S.)


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STRONTIUM [Symbol Sr, atomic weight 87.62 (0=16)]

 


 
 


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