
1) Mineral
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https://www.crosswordclues.com/clue/thorite

Thorite, (Th,U)SiO4, is a rare nesosilicate of thorium that crystallizes in the tetragonal system and is isomorphous with zircon and hafnon. It is the most common mineral of thorium and is nearly always strongly radioactive. It was named in 1829 to reflect its thorium content. Thorite was discovered in 1828 on the island of Løvøya, Norway, by th...
Found on
http://en.wikipedia.org/wiki/Thorite

• (n.) A mineral of a brown to black color, or, as in the variety orangite, orange-yellow. It is essentially a silicate of thorium.
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http://thinkexist.com/dictionary/meaning/thorite/

thorium silicate, ThSiO4, one of the most important thorium minerals. Almost always altered by hydration, it occurs in syenite near Brevik, Nor., ...
Found on
http://www.britannica.com/eb/a-z/t/42
Tho'rite noun [ So called by Berzelius from the Scandinavian god
Thor . See
Thor .]
(Min.) A mineral of a brown to black color, or, as in the variety
orangite , orange-yellow. It is essentially a silicate of thorium.
Found on
http://www.encyclo.co.uk/webster/T/47

Thorite, so called by Berzelius from the Scandinavian god Thor, is a mineral of a brown to black colour, or, as in the variety orangite, orange-yellow, and with a glassy lustre. It is essentially a silicate of thorium. Thorite is chiefly found in Norway and Sri Lanka.
Found on
http://www.probertencyclopaedia.com/browse/HT.HTM

Thorium orthosilicate
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http://www.translationdirectory.com/glossaries/glossary075.htm

[
n] - a radioactive mineral consisting of thorium silicate
Found on
http://www.webdictionary.co.uk/definition.php?query=thorite
noun a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite
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https://www.encyclo.co.uk/local/20974
(Thorium Uranium Silicate) Thorite is the most common thorium mineral. Thorium is a highly radioactive element and could be used as a replacement for uranium in nuclear power generation. It is estimated to be three times as common as uranium and all the thorium in the Earth's crust could have more potential energy than both ...
Found on
https://www.encyclo.co.uk/local/23719
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