⨀⨀⨀ quarter ⪢⪢
http://qindex.info/i.php?x=24813
○○○ silicate ⪢⪢
-- crust, silicon, feldspar, quartz, potassium, plasioclase
http://qindex.info/i.php?x=10958
○○○ #TOEIC 210 ⪢⪢
The quarterly report is going to be released tomorrow.
http://qindex.info/i.php?x=28596
 Introduction to Minerals
○ 5 citeria: solid, naturally occurring, inorganic, fixed chemical formula, specific atomic arrangement -- igneous, granite, speckle, quartz, biotite mica, plagioclase feldspar, fluorite, talc, selenite gypsum, pyrite, silicate, bituminous, sulfur, halite
http://qindex.info/i.php?x=4013
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