
1) Caoutchouc 2) Ebonite 3) Gum elastic 4) Hard rubber 5) India rubber 6) Rubber 7) Telluride mineral
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https://www.crosswordclues.com/clue/vulcanite

1) Ebonite
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https://www.crosswordclues.com/clue/vulcanite

Vulcanite is a rare copper telluride mineral. The mineral has a metallic luster, and is a green or bronze-yellow shade. It has a hardness between 1 and 2 on the Mohs scale (between talc and gypsum). Its crystal structure is orthorhombic. It is named after the place where it was discovered in 1961, the Mammoth Good Hope Mine in Vulcan, Gunnison Cou...
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http://en.wikipedia.org/wiki/Vulcanite

• (n.) Hard rubber produced by vulcanizing with a large proportion of sulphur.
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http://thinkexist.com/dictionary/meaning/vulcanite/

A hard, moldable, polished dark colored, anging from brown to black, early rubber. Vulcanite was produced by adding sulfur to vulcanized rubber. It was used for combs, ornaments, and buttons. Also called ebonite, it not the same as gutta percha.
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http://www.encyclo.co.uk/local/22290

Hard, black material made by heating rubber with sulphur and used to simulate jet in jewellery and for some early fountain pens. It is also known as ebonite.
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http://www.encyclo.co.uk/visitor-contributions.php
Vul'can·ite noun Hard rubber produced by vulcanizing with a large proportion of sulphur.
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http://www.encyclo.co.uk/webster/V/38

A hard, moldable dark brown or black early plastic sometimes erroneously called 'gutta percha'. This material was used for memorial pieces in the mid-Victorian period.
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http://www.indygem.com/pages/Glossary-of-Terms.html

See under geology. Geology Science of the structure, composition and structure of the earth's crust (earth = grch. Ge), its physical properties and its history of development as well as the processes forming it. The term was first used in 1778 by the Swiss meteorologist Jean-André Deluc (1727-1817); before that, geognosy was in use. The earth...
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https://glossary.wein.plus/vulcanite
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