PM7 Silicon dioxide H=-73.0 HR=JANAF86 Si 0.00000000 +0 0.0000000 +0 0.0000000 +0 0 0 0 O 1.38325174 +1 0.0000000 +0 0.0000000 +0 1 0 0 O 1.38318305 +1 179.9741773 +1 0.0000000 +0 1 2 0