| Riebeckite asbestos. 
 See above Actinolite sample for an extended discussion of asbestos, mesothelioma, lawyers, and litigation.
 
 Mineral details: Riebeckite (variety Crocidolite), amphibole group, double-chain silicate.  From the Greek krokid ("nap on woolen cloth").  Kuruman, Northern Cape Province, South Africa.
 
 Source: eBay seller star-stuff
 Contributor: Theodore Gray
 Acquired: 10 April, 2006
 Text Updated: 30 May, 2006
 Price: $30
 Size: 2"
 Composition: Na2Fe2(FeMg)3Si8O22(OH)2
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