White Trillium Ore

Mining [object=209313] and [object=209330] provide either Black Trillium Ore or White Trillium Ore, they are a rare spawn, normally spawn in ghost iron node locations in the same zone. Looking closely at the node you can see a black and white swirl symbol on it.

If you can see the color of the rock under the vein, the ore mined will be the same color. Example: Townlong Steppes has black rock and white rock, if a node is on black rock you get black ore, white rock you get white ore.

Update 03 Aug 2012: Locations are in Jade Forest and Valley of Four Winds Level 90 daily zones, Kun-Lai Summit, Townlong Steppes, Dreaded Wastes, and Vale of Eternal Blossoms. Each area can spawn normal or rich veins.

Note for Vale of Eternal Blossoms, all mining and herb locations are phased out unless the first quests for the Golden Lotus faction are completed, must be level 90 to start the quests.

The black and white trillium ore seem very reminiscent of the the opposing halves of the the yin yang symbol.

The name is possibly taken from Star Trek, where Trillium is named as a trade good: [1] [2].

Star Trek possibly took it from its meaning in the 'real world': Trillium is a genus that includes several species of plants [3]. The origin of the word comes from the Greek tris or the Latin tri- (three), so called for its leaves and its flower petals. [4] [5] [6]
One of their species is called White Trillium. [7]

The idea of a material that has a black component and a white component, which are complementary, comes clearly from the Yin-Yang concept from classical Chinese philosphy; you can see it exposed in the tooltip icon, and remember that Mists of Pandaria is highly inspired by China (and surroundings).