Strontianite
 
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 Strontianite is a carbonate mineral of strontium.  It has the composition SrCO3. The origin of this sample is Drensteinfurt, Nord, Rhein-Westphalen, Germany. The sample measures about 9 cm across. All these samples are on display in the Smithsonian Museum of Natural History.  
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| This sample of Strontianite is from Leogang, Salzburg, Austria. It measures about 10cm across.  |  
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 This sample of Strontianite is from Oberdorf, Styria, Austria. It measures about 8 cm across.   
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