Secret Cow Level?

[Mavfin]

OK, so let's bottom line this:

Recipe: Act 4, Izual
Black Mushroom: Act 1 in various possible locations: Crypts, Adria's hut, Cathedral
Leoric's Shinbone: Act 1, Leoric's manor in his fireplace
Wirt's Bell: Act 2, Merchant Squit the Peddler -- Cost is 100k gold.
Liquid Rainbow: ?
Gibbering Gemstone: ?

Liquid Rainbow -- Act 2, Quest Betrayer of the Horadrim, Mysterious Chest (rare spawn) in Mysterious Cave, in the Oasis, look for Zaven the Alchemist, rare spawn, to open said cave. Look in the water alcove east and south of the waypoint to find him. May take several tries to even get the cave, let alone the chest.

Gemstone - Act 3, Quest Machines of War --> Destroy Ballistae, Caverns of Frost, dropped by rare spawn Chitala (I think that's the name) If you see Ice Caves, leave game, get another, because it's one or the other cave that spawns.