Slate

Stone
Sedimentary	Sandstone • Siltstone • Mudstone • Shale • Claystone • Rock salt • Limestone • Conglomerate • Dolomite • Flint • Chert • Chalk
Igneous I.	Granite • Diorite • Gabbro
Igneous E.	Rhyolite • Basalt • Andesite • Felsite • Obsidian
Metamorphic	Quartzite • Slate • Phyllite • Schist • Gneiss • Marble
Unique	Bauxite • Lignite • Bituminous coal • Graphite • Kimberlite
Ore	Bismuthinite • Cassiterite • Copper nuggets • Galena • Garnierite • Gold nuggets • Hematite • Horn silver • Limonite • Magnetite • Malachite • Native aluminum • Platinum nuggets • Raw adamantine • Silver nuggets • Sphalerite • Tetrahedrite

Slate
Uses
	Masonry ; Stone crafting ; Construction ;
Properties
	Metamorphic layer ; Material value 1 ;
Contains
	Galena ; Sphalerite ; Tetrahedrite ; Cinnabar ; Cobaltite ; Hornblende ; Rutile ; Orthoclase ; Microcline ; Mica ; Ornamental gems Morion ; Schorl ; Prase ; Prase opal ; Moss opal ; Cherry opal ; Smoky quartz ; Wax opal ; Wood opal ; Amber opal ; Gold opal ; Citrine ; Resin opal ; Pyrite ; Clear tourmaline ; Shell opal ; Bone opal ; Milk quartz ; Moonstone ; Jasper opal ; Pineapple opal ; Onyx opal ; Milk opal ; Pipe opal ; Rose quartz ; Rock crystal ; Semi-Precious gems Black zircon ; Black pyrope ; Indigo tourmaline ; Blue garnet ; Green tourmaline ; Green zircon ; Red zircon ; Red tourmaline ; Red pyrope ; Almandine ; Pink tourmaline ; Fire opal ; Rhodolite ; Purple spinel ; Violet spessartine ; Pink garnet ; Jelly opal ; Brown zircon ; Yellow zircon ; Yellow spessartine ; Rubicelle ; Clear garnet ; Clear zircon ; Amethyst ; Red spinel ; Precious fire opal ; Red flash opal ; Black opal ; White opal ; Crystal opal ; Claro opal ; Levin opal ; Harlequin opal ; Pinfire opal ; Bandfire opal ;
	Wikipedia article

Slate is one of the types of stone that forms entire layers.

"Slate" is also the name of the second month of the dwarven calendar, covering mid Spring.