STC ratings of standard materials?

LEED guidelines typically apply to the construction of partitions. In this case STC ratings for wall partitions can be found at: http://www.usgdesignstudio.com/wall-selector-overview.asp

Where glass partitions are used we'd recommend obtaining the STC rating from the manufacturer that is specified as these can vary greatly from system to system.

In some instances STC ratings for fenestration may be needed as well.  As above, it's always best to obtain STC ratings from the specific manufacturer.  But various glass manufacturers such as Viracon publish STC ratings for different glass configurations. Note these are glass-only and often a correction will need to be applied to account for deficiencies for a fully framed window system. Link to Viracon below:

http://www.viracon.com/acoustic