Using the 9005948.cif (1991) with the cif2cell command gave me a lot of warnings, but when you use 9012778.cif (2007) this problem is fixed. I guess it is better to use the new ones instead of old files
***Warning: Si1a is not a chemical element.
***Warning: Si2a is not a chemical element.
***Warning: Si3a is not a chemical element.
***Warning: Si4a is not a chemical element.
***Warning: O1a is not a chemical element.
***Warning: O2a is not a chemical element.
***Warning: O3a is not a chemical element.
***Warning: O4a is not a chemical element.
***Warning: O5a is not a chemical element.
***Warning: O6a is not a chemical element.
***Warning: O7a is not a chemical element.
***Warning: O8a is not a chemical element.
***Warning: O9a is not a chemical element.
***Warning: O10a is not a chemical element.
***Warning: O11a is not a chemical element.
***Warning: O12a is not a chemical element.