QUOTE (Fortune @ Apr 11 2008, 10:34 AM)

It specifically doesn't mention elemental damage at all. Merely 'elemental effects', which are differentiated from 'damage' in the descriptions of the Elemental Combat Spells (where elemental effects are described).
Elemental strike does not mention the types of damage, the descriptions for the damage does. Elemental strike references pages 154-155 of SR4.
SR4, 154:
"Acid damage is treated as Physical damage and resisted with half Impact armor (rounded up)."
"Cold damage is treated as Physical damage and resisted with half Impact armor (rounded up)."
"Electrical damage is treated as Stun damage and resisted with half Impact armor (rounded up)—metallic armor, however, offers no protection."
SR4, 155:
"Treat Fire damage as Physical damage, but Impact armor only protects against it with half its value (round up)."
It also references pages 164-165 of Street Magic.
164, SM:
"Blast damage is treated as Physical damage and is resisted with half Impact armor (rounded up)."
"Treat the Ice effect as Cold damage (p. 154, SR4), except that objects or terrain affected will be encrusted with ice."
"Light damage is treated as Physical damage and is resisted with half Impact armor (rounded up)."
Metal doesn't specify its damage type, only, "Metal damage attacks are resisted with Impact armor."
165, SM:
"Sand damage is treated as Physical damage and is resisted with half Impact armor (rounded up)."
Smoke says, "The victim resists Stun as if from an inhalation vector toxin attack (see p. 244, SR4)."
"Sound damage is treated as Stun damage. Armor has no effect,"
"Water damage is treated as Physical damage and is resisted with half Impact armor (rounded up)."
You say it doesn't mention the damage it does, only that it does an elemental effect. The effects themselves (on the pages that it references) state the damage that they do. The elemental effects section for casting that you mentioned only references those same pages, and then goes on to expand on the
secondary effects of the spells.
Elemental effects do not equal secondary effects. If they had intended for elemental strike to only have the secondary effects, the power should have been worded to state such. As it is, it is the elemental effects, which specify their damage types in their descriptions on the pages the power references.