
1) Calcium mineral 2) Iron mineral
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https://www.crosswordclues.com/clue/melilite

Melilite refers to a mineral of the melilite group. Minerals of the group are solid solutions of several endmembers, the most important of which are gehlenite and åkermanite. A generalized formula for common melilite is (Ca,Na)2(Al,Mg,Fe2+)[(Al,Si)SiO7]. Discovered in 1793 near Rome, it has a yellowish, greenish brown color. The name derives from...
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http://en.wikipedia.org/wiki/Melilite

• (n.) A mineral occurring in small yellow crystals, found in the lavas (melilite basalt) of Vesuvius, and elsewhere.
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http://thinkexist.com/dictionary/meaning/melilite/

any member of a series of silicate minerals that consist of calcium silicates of aluminum and magnesium; gehlenite is the aluminous end-member and ...
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http://www.britannica.com/eb/a-z/m/67
Mel'i·lite (mĕl'ĭ*līt)
noun [ Greek
me`li honey +
-lite ; confer French
mélilithe .]
(Min.) A mineral occurring in small yellow crystals, found in the lavas (
melilite basalt ) of Vesuvius, and elsewhere. [ Written also
mellilite .]
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http://www.encyclo.co.uk/webster/M/44

Melilite is a mineral occurring in small yellow crystals, found in the lavas of Vesuvius, and elsewhere.
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http://www.probertencyclopaedia.com/browse/HM.HTM
No exact match found.