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28_9de5c05320ccdc491872fa501c117601
2005-05-26 12:19:41

Amphibole defines an important group of dark-colored rock-forming inosilicate minerals composed of double chain SiO4 tetrahedra linked at the vertices and generally containing ions of iron and/ or magnesium in their structures. In chemical composition and general characteristics they are very similar to the pyroxenes and, like them, fall into three series according to their system of crystallization. The chief difference between amphiboles and pyroxenes is in cleavage: amphiboles form oblique...

28_2d79dc61ecefd3449819abf298f2554d
2005-05-26 12:16:31

Asbestos (Greek a-, "not"; sbestos, "extinguishable") is a group of fibrous metamorphic minerals. The name is derived for its historical use in lamp wicks; the resistance of asbestos to fire has long been exploited for a variety of purposes. It was used in fabrics such as Egyptian burial cloths and Charlemagne's tablecloth, which, according to legend, he threw in a fire to clean. When asbestos is used for its resistance to fire or heat, the fibers are typically mixed with cement or woven...

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Word of the Day
pungle
  • To take pains; labor assiduously with little progress.
This word comes from the Spanish 'pongale,' put it.
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