Lucid

Lucid (透きとおる) is a material type available in Kingdom Hearts and Kingdom Hearts II. Lucid materials contain the essence of emptiness, and are colored clear.

Design
In Kingdom Hearts II, a Lucid Shard is represented as a hooked, somewhat translucent, black jewel. The word "lucid" means "clear" or "transparent”, hence the partial translucency.

A Lucid Stone is represented by three jewels, one shaped like an uneven cube and two with a longer, oblong shape. All three of these jewels are black and partially translucent.

A Lucid Gem is represented by four partially translucent, black jewels with facet cuts. The topmost jewel is the largest, the two on the sides are both between the other two in size, and the lowest one is the smallest.

A Lucid Crystal is represented by a large jewel shaped like a five-pointed star and three smaller jewels. One jewel with a facet cut is placed below the star-shaped jewel, and two shaped like diamonds are placed to either side of the star jewel. All four pieces are black and seem to be partially translucent.

Kingdom Hearts

 * Lucid Shard: Shadow (6%), White Mushroom (100%), Bambi (40%/60%)
 * Lucid Gem: Gargoyle (4%), Wight Knight (4%), White Mushroom (10%/40%), Bambi (30%/40%/60%)
 * Lucid Crystal: Darkball (1%), Bambi (30%)

In Kingdom Hearts Final Mix, Lucid Shards are also dropped by the Gigant Shadow.

Kingdom Hearts II

 * Lucid Shard : Rabid Dog (6%), Trick Ghost (10%)
 * Lucid Stone : Graveyard (12%), Toy Soldier (12%), Wight Knight (8%)
 * Lucid Gem : Bookmaster (10%), Magnum Loader (8%)
 * Lucid Crystal: Neoshadow (8%)

Kingdom Hearts
Lucid materials are used to synthesize the following items:
 * Dark Ring (2 Lucid Shard)
 * Golem Chain (1 Lucid Gem)
 * Master Earring (3 Lucid Shard, 2 Lucid Gem)
 * Defense Up (5 Lucid Shard, 3 Lucid Gem, 1 Lucid Crystal)
 * Crystal Crown (3 Lucid Crystal)
 * Ultima Weapon (5 Lucid Gem)

Kingdom Hearts Final Mix
Lucid materials are used to synthesize the following items:
 * Cottage (1 Lucid Shard)
 * Power Chain (1 Lucid Shard)
 * Dark Ring (2 Lucid Gem)
 * Gaia Bangle (5 Lucid Shard, 3 Lucid Gem)
 * Defense Up (3 Lucid Shard)
 * Heartguard (3 Lucid Gem, 1 Lucid Crystal)
 * Crystal Crown (5 Lucid Crystal)
 * Dark Matter (9 Lucid Shard)
 * Megalixir (5 Lucid Gem, 3 Lucid Crystal)

Kingdom Hearts II
Lucid materials are used to synthesize the following items:
 * Mega-Potion (1 Lucid Shard)
 * Mega-Ether (1 Lucid Shard)
 * Defense Boost (3 Lucid Crystal)
 * Power Boost (3 Lucid Crystal)
 * Midnight Anklet (1 Lucid Stone, 1 Lucid Shard)
 * Chaos Anklet (1 Lucid Stone, 1 Lucid Shard)
 * Power Band (1 Lucid Stone)
 * Buster Band (1 Lucid Stone)
 * Soldier Earring (1 Lucid Gem)
 * Fencer Earring (1 Lucid Gem)

Notes and References
Hyalin