  Anthracite coal.
I purchased about 1000 pounds in the early 1990s for blacksmithing use by Jim Zimmerman at our farm. We had to build a special box on the trailer to bring it home, and most of it is still sitting in large plastic containers in the shed. No problem finding a sample for the table!
The sound is steel plate being beaten with a blacksmith's hammer after heating in a coal fire.
Source: Coal Dealer
Contributor: Theodore Gray
Acquired: 15 April, 2002
Price: $0.008/ounce ($250/ton)
Size: 2"
Purity: >85%
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