phyllo-silicate

phyl·lo·sil·i·cate

[fil-oh-sil-i-kit, -keyt]
noun
any silicate mineral having the tetrahedral silicate groups linked in sheets, each group containing four oxygen atoms, three of which are shared with other groups so that the ratio of silicon atoms to oxygen atoms is two to five.

Origin:
1945–50; phyllo- + silicate

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
phyllosilicate (ˌfɪləʊˈsɪlɪkeɪt) [Click for IPA pronunciation guide]
 
n
any of a class of silicate minerals, including talc, consisting of thin sheets

Collins English Dictionary - Complete & Unabridged 10th Edition
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Phyllo-silicate is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.
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