It is an eruptive rock of a volcano. Ebonite. Rubber black and very hard.
Anónimo
Vulcanite: Telluride Yes, ple of copper, which crystallizes in the Orthorhombic system and dipiramidal.
Anónimo
Group of eruptive rocks thrown by a volcano.Vulcanized rubber black and very hard, can be carved and polished: the vulcanita is used to make Electrical insulators.
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