Locations:

Head-Molten Core-Garr
Shoulders-Molten Core-Baron Geddon
Chest-Molten Core-Golemagg the Incinerator
Pants-Molten Core-Magmadar
Gloves-Molten Core-Gehennas
Boots-Molten Core-Lucifron
Belt-Molten Core-Trash Mobs
Bracers-Molten Core-Trash Mobs

I like to think that this set has some sort of historical significance in the development of the shaman's role in raids.

The Earthfury gives some indication of how Blizzard, once upon a time, intended raid healer mechanics to work. Note the high amounts of spirit as well as the subtle additions of spell crit. Before damage and healing were consolidated into spell power, some of the pieces offered only healing bonuses, while others offered both.

In BC, the available gear demonstrated that shaman healing mechanics should rely very little on spirit and non-healing bonuses, which had their budget reallocated almost ubiquitously to mp5. The evolution continues in WotLK, with crit and haste valued over mp5.

And let's not forget what Earthfury was way back when. I recall several of the pieces having +agility. =)

Redesigned set made for BC instances. Just wanted to add this is here in case anyone wanted to go back and get the set but didn't want to do any pre-bc raids to get it. Good luck!

Head: http://classicdb.ch/?item=27993 Mask of Inner FIre, Black Morass
Shoulder: http://classicdb.ch/?item=27454 Volcanic Pauldrons, Ramps
Legs: http://classicdb.ch/?item=28266 Molten Earth Kilt, Mechanar
Chest: http://classicdb.ch/?item=28391 Worldfire Chestguard, Arcatraz
Gloves: http://classicdb.ch/?item=27793 Earth Mantle Handwraps, Steamvault
Boots: http://classicdb.ch/?item=27845 Magma Plume Boots, Crypts
Bracers: http://classicdb.ch/?item=27522 World's End Bracers, Blood Furnace
Belt: http://classicdb.ch/?item=27743 Girdle of Living Flame, Underbog

The 5 piece bonus is (was) the reason to get this set. It gives the user an 8.75% reduction overall when casting both LHW and HW.

Healing Wave (Rank 12) - 720 mana, 657 with set (63 mana saved per cast)

Lesser Healing Wave (Rank 7) - 440 mana, 401.5 with set (38.5 mana saved per cast)

Even if you were to only cast 15 LHWs per minute (only 22.5 seconds of casting per 60), you'd be regaining the mana equal to 48 / 5 regen. It's easy to see why this is such a hard set for some Shamans to give up.