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A kind of light pebble or light sand being made of shale, clay, or slate with gravity 2.6 is characterized in that the gravity becomes 0.4-2.0 after it is finished with heat and the finished article has a puff inner structure with vacuum empty inner space and has glass like surface.
TW085104867A1996-04-241996-04-24Light pebble and light sand and method for making the same
TW338017B
(en)
Unit for the multi-layer storage and sorting of tiles, in particular of so-called special ceramic tiles, such as small glazed floor tiles, mosaic tesserae and the like