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sphenoclase
sphenoclase n. 
/ˈsfiːnə(ʊ)kleɪs/, /ˈsfinəˌkleɪz/ (see quots.), or of genera of animals or plants.
Brit. /ˈsfiːnə(ʊ)kleɪz/
, /ˈsfiːnə(ʊ)kleɪz//ˈsfiːnə(ʊ)kleɪs/U.S. /ˈsfinəˌkleɪs/
, /ˈsfinəˌkleɪs//ˈsfinəˌkleɪz/ΚΠ
1868 H. Watts Dict. Chem. V. 399 Sphenoclase, a mineral occurring in parallel layers..in a bluish granular limestone..in Norway.
1896 A. H. Chester Dict. Names Minerals Sphenoclase, a questionable silicate of calcium, etc., of yellowish color.
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