1) Gemstone 2) The mineral titanite
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https://www.crosswordclues.com/clue/sphene
• (n.) A mineral found usually in thin, wedge-shaped crystals of a yellow or green to black color. It is a silicate of titanium and calcium; titanite.
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http://thinkexist.com/dictionary/meaning/sphene/
Sphene noun [ French
sphène , from Greek
sfh`n a wedge.]
(Min.) A mineral found usually in thin, wedge-shaped crystals of a yellow or green to black color. It is a silicate of titanium and calcium; titanite.
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http://www.encyclo.co.uk/webster/S/161
Sphene (titanite, calcium silicate or titanate) is a variety of titanite and a source of titanium. A rather common accessory mineral in igneous rocks, it is a light yellow or green colour and sometimes a dark brownish green colour. It is often found as crystals, particularly in the Tirol, and is commonly associated with chlorite. It has the formula...
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http://www.probertencyclopaedia.com/browse/HS.HTM
Titanite
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http://www.translationdirectory.com/glossaries/glossary077.htm
(Calcium Titanium Silicate) Sphene is named from the greek word for wedge, because of its typical wedge shaped crystal habit. It is also alternatively called titanite for its titanium content. Spene can be cut as gems although it is considered a rarity on the gem market. It brings to the table a fire greater than diamond and uni...
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https://www.encyclo.co.uk/local/23719
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