1) Metamorphic rock
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https://www.crosswordclues.com/clue/fulgurite
Fulgurites (from the Latin fulgur, meaning `thunderbolt`) are a variety of the mineraloid lechatelierite. They are natural hollow glass tubes often formed during lightning strikes, in quartzose sand, silica, or soil. Sometimes they are referred to as petrified lightning. Fulgurites may be instances of Lichtenberg figures, which are branching pat.....
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http://en.wikipedia.org/wiki/Fulgurite
• (n.) A vitrified sand tube produced by the striking of lightning on sand; a lightning tube; also, the portion of rock surface fused by a lightning discharge.
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http://thinkexist.com/dictionary/meaning/fulgurite/
a glassy silica mineral (lechatelierite or amorphous SiO2) fused in the heat from a lightning strike. Fulgurite is a common mineral with two ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/f/69
Ful'gu·rite noun [ Latin
fulguritus , past participle of
fulgurire to strike with lightning, from
fulgur lightning: confer French
fulgurite .] A vitrified sand tube produced by the striking of lightning on sand; a lightning tube; also, the portion of rock surface fused by a ...
Found on
http://www.encyclo.co.uk/webster/F/84
Fulgurite is a term applied to rocks whose surface has been melted by the action of lightning, and on which the fused material has re-solidified as a kind of thin coat or varnish. More strictly, the term is applied to a vitrified tube of sand formed by the intense heat of lightning penetrating the sand, and fusing a portion of the materials through...
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http://www.probertencyclopaedia.com/browse/HF.HTM
fulgurite, fulgurites 1. In geology, a glassy, tubular rock structure or crust that is formed when lightning strikes dry sand or unconsolidated sandy soil and causes it to fuse. 2. A vitrified sand tube produced by the striking of lightning on sand; a lightning tube; also, the portion of rock surface fused by a lightning discharge. 3. Etymology: ...
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http://www.wordinfo.info/words/index/info/view_unit/3280/
a tubelike formation in sand or rock, caused by lightning.
Found on
https://www.infoplease.com/dictionary/fulgurite
No exact match found.
