BELL-LIKE ROCK.
A rock that rings like a bell when struck with a hammer hae been placed on exhibition in the museum of the Academy of Natural Sciences at Philadelphia. Swung on two heavy chains, the 4001b mass of diabase, or trap rock, sounds a clear, vibrant note when struck by the visitor. All forms of this rock will not ring. Some natural factor occurring almost exclusively in what is now Pennsylvania, eonie million or more years jago, produced these "ringing rocks." ThoEe which give the ringing sound solidified while in the molten condition. Their finegrained textile had been examined by s'cieritists, wno declare that one ;of minerals contained "in them, feldspar, foi-ms a lacpwork of lath-shaped : crystals not unlike the arrangement of metallic cry-tale in bell metal. This permits "the vibrations to travel throughout the entire muss.
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Bibliographic details
Auckland Star, Volume LXIII, Issue 209, 3 September 1932, Page 3 (Supplement)
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138BELL-LIKE ROCK. Auckland Star, Volume LXIII, Issue 209, 3 September 1932, Page 3 (Supplement)
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