In case it is of help, I found in our library a 56th edition (1975-
76) and a 77th edition (1996-97) of the CRC Handbook of Chemistry and 
Physics. Both have tables entitled 
"CRYSTAL IONIC RADII OF THE ELEMENTS" (pages F209 to F210 and 12-14 
to 12-15 respectively)

with these values:

> >     (8 << 4) + (-2 + 4),  1320, // "O-2"
1.32  (56th)
1.36 for CN 3 (coordination number, 77th)
1.40 for CN 6

> >     (8 << 4) + (-1 + 4),  1760, // "O-1" // WAY too large?
1.76  (56th)
1.37 for "OH(-1)", CN 6  (77th)

> >     (14 << 4) + (-4 + 4), 2710, // "Si-4"
2.71  (56th)
no entry (77th)

> >     (14 << 4) + (-1 + 4), 3840, // "Si-1" // same problem here?
3.84  (56th)
no entry (77th)

> >     (34 << 4) + (-2 + 4), 1910, // "Se-2"
1.91  (56th)
1.98  CN 6 (77th)

> >     (34 << 4) + (-1 + 4), 2320, // "Se-1" // same problem here?
2.32  (56th)
no entry  (77th)



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