1) Volcanic rock
Found on
https://www.crosswordclues.com/clue/tephrite
Tephrite is an igneous, volcanic (extrusive) rock, with aphanitic to porphyritic texture. Mineral content is usually abundant feldspathoids (leucite or nepheline), plagioclase, and lesser alkali feldspar. Pyroxenes (clinopyroxenes) are common accessory minerals. Quartz and olivine are absent. Occurrences include leucite nepheline tephrite from Ham...
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http://en.wikipedia.org/wiki/Tephrite
• (n.) An igneous rock consisting essentially of plagioclase and either leucite or nephelite, or both.
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http://thinkexist.com/dictionary/meaning/tephrite/
(from the article `basanite`) Basanites and tephrites occur as gray to black rocks in sheets and flows. Places where basanites are found include Spain, Hungary, Italy, New ...
Found on
http://www.britannica.com/eb/a-z/t/26
Teph'rite noun [ Greek ... ashes.]
(Geol.) An igneous rock consisting essentially of plagioclase and either leucite or nephelite, or both.
Found on
http://www.encyclo.co.uk/webster/T/28
Tephrite is an igneous rock consisting essentially of plagioclase and either leucite or nephelite, or both.
Found on
http://www.probertencyclopaedia.com/browse/HT.HTM
No exact match found.
