We have no meanings for "pure silica" in our records yet.
1 In general, the soil is light-colored soft sand, nearly pure silica .
2 I found also a piece of palm-tree transformed into oxide of iron, and the pores filled with pure silica .
3 Of course, it isn't pure silica , because sand deposits like that don't exist, but it's so near it's unbelievable.
4 I suppose white silver sand, sold for cleaning harness, etc., is nearly pure silica , but what am I to do for alumina?
5 Dr. Turner found the ignited Indian tabasheer to consist almost entirely of pure silica with a minute quantity of lime and vegetable matter.
6 We also estimate that the n(2) of germania is three times the n(2) of pure silica .
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