Silicate polymorphs

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0
61779
0
60
block

example of a mineral with an isolated tetrahedra polymorph

Select the correct answer(s).  

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61780
0
60
none
61781
0
60
none
61783
0
60
none
61784
0
60
none
61786
0
120
none
61787
0
60
none
61788
0
60
none
61789
0
60
none
61790
0
30
none
61791
0
120
none
61792
0
60
none
61794
0
60
none
61795
0
60
none
61796
0
60
none