Ore Vein

Ore Veins
Ore veins are large boulders that contain a significant amount of ore. By mining (link needed) an ore vein till it breaks, players can receive between two and three ore. Different ore veins contain different types of ore and can be identified by visual cues or by their drops.

Sandstone
Sandstone is one of the two ore veins that can be found in the Overworld(link needed) (along with coal), but can also be found in the Mines (link needed). The ore vein has a light tan appearance and appears in large clusters. As of 0.9.1 (May 30th 2018), sandstone's main use is for beginner practice and working out the mechanics of mining. Due to it's presence in the Overworld, it can also be used to gauge the relative effectiveness of different pickaxes without needing to face the dangers in the mines. Otherwise, sandstone has no uses in crafting.
 * [*[Image:filename.extention|thumb|A clay ore vein found in the overworld]]

Coal
Coal is one of the two ore veins found in the Overworld (along with Sandstone), but can also be found in the Mines. The ore vein has a distinct black and rounded appearance, and can be overlooked without good lighting. Almost all mining expeditions, regardless of progress, mine coal since it is heavily used in The Smithy (link needed) and Lanterns (Link needed). As such, coal is regularly in the upper levels of the Mines.