These furry little critters also dropped for me today Malachite, Emerald, and Peridot randomly.
Got the Granite after about 20ish minutes of slaughtering them. Invis'd up, sent pet in to play, waited to see which corpses would last after the rest poofed and looted them.
Mine dropped from the area near the ruins along the zone wall that about 7 or 8 bunnies spawn, surrounded by cliffs on both sides with wolves waiting to pounce.
the items listed as it's drops are actually Zone Wide Rares. They have a very rare drop rate so you can camp the bunnies for them, but it could take days or weeks before you see anything drop.
TIM: There! ARTHUR: What, behind the rabbit? TIM: It is the rabbit. ARTHUR: You silly sod! TIM: What? ARTHUR: You got us all worked up! TIM: Well, that's no ordinary rabbit! ARTHUR: Ohh. TIM: That's the most foul, cruel, and bad-tempered rodent you ever set eyes on! ROBIN: You tit! I soiled my armour I was so scared! TIM: Look, that rabbit's got a vicious streak a mile wide! It's a killer! GALAHAD: Get stuffed! TIM: He'll do you up a treat, mate. GALAHAD: Oh, yeah? ROBIN: You mangy Scots git! TIM: I'm warning you! ROBIN: What's he do, nibble your bum? TIM: He's got huge, sharp-- eh-- he can leap about-- look at the bones! ARTHUR: Go on, Bors. Chop his head off! BORS: Right! Silly little bleeder. One rabbit stew comin' right up! TIM: Look! [squeak] BORS: Aaaugh!