ok, i dont have co-ords atm, but here is a list of my favourite mobs to farm for Beryl shards, most high lvl's (45+) probably know these anyway......
ANGMAR:
Drankah - lvl45ish, 3-4k HP human angmarim - Ram Duath, spawns in the angmarim camp and then wanders around Ram Duath until killed....MANY ppl farm this mob.
Chillgrip - lvl45ish - 8-9k HP hill-beast - Outside Aughaire by the hill-beast main population (towards the drakes)
Swale-Singer - lvl45ish 4k HP norburg - Malenhad - Can spawn anywhere in Malenhad where there are norburgs so difficult to farm, but if u happen to see him......
MISTY MOUNTAINS:
There is an excellent 'tell' as to whether a beryl shard dropper is in MM, basically, once past the northern high pass (far eastern section of MM, up near Goblin Town) if u ride into VERY thick fog that drastically reduces ur vision.....then there is a dropper around.
RODLUG - lvl45ish, 9k HP Worm - Northtarn, Rodlug is tough, but with good traits and equipment is soloable, but will take u to the edge...Many ppl go after Rodlug in f/s of 2 or more
THE ANTLERED KING - lvl45ish 4k HP Longhorn - Usually on the path to GT secret entrance
****** - lvl45ish 4k HP Warg - Have found him all over the place, but always in the area around GT, path to secret entrance, by dwarf camp, by Warg main population.... (forgot his name atm, hence the *****)
****** - lvl45ish 8k HP Gauradan - Cirith Rir (normally, but can spawn up near northtarn)
In a slightly different area, but still in MM i came across a lvl48 Elite dwarf (towards Gabilizar, near the respawn circle) I have only seen this mob once and he was exceptionally tough (would suggest the use of food before the fight) and i had to use a handful of power potions during the fight.
Anyway, will try to get exact co-ords and fill in the missing names, but hope this is of help to some.