Oleg Kadkin Feb 8, 2013:

:)

Jack slep Feb 8, 2013:

Thank you, Oleg. You're a gentleman and scholar.

Oleg Kadkin Feb 8, 2013:

Jack, now I have got your point. In another words, it can be expressed in Russian as "метавулканические и аповулканические сланцы". However, they used the more special term 'метавулканитовые и аповулканитовые'. In essence, you are completely right.

Jack slep Feb 8, 2013:

Oleg, Hi! Thanks for your comments. I'm aware that vulcanite, Goodyear's serendipitous discovery, is an obsolete term for hard rubber/ebonite. However, the mineral vulcanite CuTe is rare worldwide with a small find in Russia. Hence, I don't thinks it's vulcanite in the given situation. The 2 vol. Russian Geol. Dictionary (Izd. Nedra, Moscow, 1973) gives, besides CuTe, "a gceneral term for volcanogenic rocks regardless of origin, outflowing or eruption." Volcanogenic seems to be preferred to volcanic in Rus. geol. texts.
These are also called simply "volcanics." I know the etymology of the geological terms, but thanks for the refresher course. The word used most often, IMHO, for igneous is изверженный, but that depends on the authors. Best regards.

Oleg Kadkin Feb 8, 2013:

Hi, Jack. Your comment is very appropriate indeed. I also did some investigation. Vulcanite, which is a mineral or rock composed of Copper(II) telluride, corresponds to "вулканит" in Russian, with the same meaning. It is happen to be a rock of volcanic origin.
And what you are talking about is probably 'эбонит' in Russian, not 'вулканит'. Quat. from Wiki: "Ebonite was a brand name for very hard rubber first obtained by Charles Goodyear by vulcanizing rubber for prolonged periods. It is about 30% to 40% sulfur... The material is known generically as hard rubber and has formerly been called "vulcanite", although that name now refers to the mineral vulcanite."
Volcanite in English:
Igneous rock (derived from the Latin word igneus meaning of fire, from ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava. In this case it can be translated to Russian as "магматическая или же вулканическая" порода, but not as "вулканитовая". Regards.

Jack slep Feb 8, 2013:

With due all respects: In geology, apo is a prefix implying derivation of one kind of rock from another, applied specifically to the name of volcanic rocks. Volcanites in Russian is a generic term for volcanic rocks; vulcanite is a hard rubber produced by vulcanizing with sulfur, you know, like your car tires. "Volcanic" in Russian also means igneous, try that when applicable. I don't know what you did with "задугового рифтогенеза" but I'm just the Ancient Translator and you know your language better than I, perhaps not scientifically, but I'm here to help, right or wrong.