40d:The Non-Dwarf's Guide to Rock

Wondering what that new kind of rock your dwarves just struck is good for? Possibly nothing, but when you're just getting started it can be tough to tell the trash from the treasure. The following table summarizes the types of stone and ore found in Dwarf Fortress (note that it does not include gems).

The Uses column lists any special uses or properties of this particular stone type; if no uses are listed, you can always use the stone for general construction and crafting. Note that many "low value" materials are still very useful in a Dwarf Fortress. "Colors" are useful for color coding or creative aesthetic uses.

For more detailed and expanded information, see the Stone, Ore, Metal, Alloy, Veins & Clusters, and Smelting pages, or the article on any particular stone, metal or ore.

Table of Rocks

(Some materials are worth an additional comment; these are numbered, with notes below table.)

Name	Type	Uses
Adamantine, raw	THE highest value "ore"1	becomes Adamantine1, by far the most valuable substance
Alabaster	stone
Aluminum, native	a high-value ore	smelt into Aluminum, a highest-value metal
Alunite	stone
Andesite	layer stone
Anhydrite	stone
Basalt	layer stone
Bauxite	stone	the only magma-safe stone2; only source of some high-value gems, dark red color
Bismuthinite	rare/obscure ore	ingredient of Bismuth Bronze
Bituminous coal	stone	smelt into Fuel, flammable
Borax	stone
Brimstone	stone	yellow color
Calcite	stone	Flux, mid-value stone
Cassiterite	uncommon ore	smelt into Tin, a low-value metal; ingredient of Bronzes
Chalk	layer stone	Flux, mid-value stone
Chert	layer stone
Chromite	stone
Cinnabar	stone	red color
Claystone	layer stone
Cobaltite	stone	blue color
Conglomerate	layer stone
Copper, native	common low-value ore	smelt into Copper, a low-value metal
Cryolite	stone
Diorite	layer stone
Dolomite	layer stone	Flux, mid-value stone
Felsite	layer stone
Flint	layer stone
Gabbro	layer stone	only source of some ores & gems
Galena	ore	smelt into Lead, a low-value metal, w/ a 50% chance3 for Silver
Garnierite	uncommon ore	smelt into Nickel, a low-value metal, magma-safe
Gneiss	layer stone
Gold nuggets	ore	smelt into Gold, a high-value metal
Granite	layer stone	only source of some ores; relatively rich in content
Graphite	stone	flammable
Gypsum	stone	yellow color
Hematite	ore	smelt into Iron, a mid-value metal; ingredient for Steel
Horn silver	ore	smelt into Silver, a mid-value metal
Hornblende	stone
Ilmenite	stone
Ice4	stone/water4	light blue color
Jet	stone
Kaolinite	stone	dark red color
Kimberlite	stone	only source of Diamonds, dark blue color
Lignite	stone	smelt into Fuel, flammable
Limestone	layer stone	Flux, mid-value stone
Limonite	high-value ore	smelt into Iron, a mid-value metal; ingredient for Steel
Magnetite	high-value ore	smelt into Iron, a mid-value metal; ingredient for Steel
Malachite	low-value ore	smelt into Copper, a low-value metal
Marble	layer stone	Flux, mid-value stone
Marcasite	stone
Mica	stone
Microcline	stone	cyan color
Mudstone	layer stone
Obsidian	layer stone	create stone short swords, highest value stone signifies nearby magma if not a layer
Olivine	stone	may contain Platinum, green color
Orpiment	stone	yellow color
Orthoclase	stone	yellow color
Periclase	stone
Petrified wood	stone	red color
Phyllite	layer stone
Pitchblende	stone	purple color
Platinum nuggets	highest-value ore	smelt into Platinum, a highest-value metal
Puddingstone	stone	mud color
Pyrolusite	stone
Quartzite	layer stone
Realgar	stone	red color
Rhyolite	layer stone
Rock salt	layer stone
Rutile	stone	purple color
Saltpeter	stone	yellow color
Sandstone	layer stone
Satinspar	stone
Schist	layer stone	brown color
Selenite	stone
Serpentine	stone	green color
Shale	layer stone
Siltstone	layer stone
Silver nuggets	ore	smelt into Silver, a mid-value metal
Slate	layer stone
Sphalerite	uncommon ore	smelt into Zinc, a low-value metal; ingredient for Brass
Stibnite	stone
Sylvite	stone	yellow color
Talc	stone
Tetrahedrite	low-value ore	smelt into Copper, a low-value metal, w/ a 20% additional chance3 of Silver; smelt into Billon

Value of rocks & metals

You won't find the terms "low-value" or "highest-value" used in the game, but they're handy here for rough comparison. "Values" are all relative to each other, on a common scale. The "material value" number multiplies any final product that is created with that material by that number. An average generic statue (base value 25) is worth much more than an average generic throne (base value 10), but a throne carved from raw gold nuggets (10 x 30 = 300) will be worth far more than a common-stone statue (25 x 1 = 25). (Note - "quality" also factors in to total value of a final product, as do some other considerations, but those are outside the scope of this intro article). Bottom line - when in doubt, go for the more valuable stuff.

Common stones (the vast majority) have a value multiplier of x1, mid-value (all flux stones) are x2, and high-value (obsidian only) is x3. This affects things like stone tables and doors, statues or stonecrafts - anything made from stone. Metal ores have varying values, from 2-40, and can either be treated as stone or smelted into bars of metal.

(To be complete and for comparison, all wood has a value of x1, equal to common stone.)

For metals, low-value (like copper or nickel) is x2. Mid-value (silver or iron) is around x10, high-value (gold, steel) is x30, and highest-value (platinum, aluminum) is x40. Note that the raw mined ore and the smelted pure metal often have different value multipliers, but not always. Alloys like brass or bronze are often more valuable than the sum of their pure metal ingredients, and have a true spectrum of values between 3-23. (Alloy values are not listed in this article.) Metal can be crafted into weapons, armour or tools, decorations, furniture or even buildings.

Notes:

1. Adamantine is not exactly like other metals, although it works almost the same. It has a value multiplier of x300 (yes, three hundred). It is also quantums better than steel for all combat purposes, and steel is clearly the best material otherwise available. See adamantine for a full discussion of this unusual and ultimate material.

2. Bauxite: Magma will melt most stone, and while there are some magma-safe metals, mechanisms can only be made from stone (or processed adamantine), not metal. Bauxite (or adamantine) is the only stone that will not melt in magma (see magma-safe), and so is uniquely suited for that purpose.

3. % chance for additional metals - when Galena and Tetrahedrite are smelted, they produce (respectively) 1 lead or 1 copper bar, 100% of the time. They occasionally produce a second, additional bar of the second metal, with the % chance as listed above.

4. Ice has some very unusual properties in Dwarf Fortress, and can be disastrous if misused. See article on ice for a more complete discussion.

How to find a rock

Basically, you look under other rocks. The trick is to have a good guess which other rocks to look under to find the one type that you're looking for.

In the main article for every rock (many generic/low-value ones share another table on the stone page), there is information about where these stones can be found. Usually that's in a type of layer, or sometimes within another specific or general type of stone. Sometimes the rock is a layer stone. If it's found in sedimentary, igneous intrusive, igneous extrusive, metamorphic or soil, those are broad classifications that cover many different types of layer stone. A layer stone means it creates the dominant layer of that entire area, as defined by the "area block" (see next). By figuring out where the type of rock/ore you are looking for is found, you can dig in areas that have a better chance of having it.

Area Blocks

Okay, this is the "advanced basic" part of the lesson - then we're done.

When you first start a new game, and you're looking at the embark map, there is the World map on the right, the Region map in the middle, and the Local map on the left. The icons on the local map relate 1:1 to what are called "area blocks" on the game map, the map where your dwarves will move around. Each area block is 48x48 tiles square. The game is smart enough to make the borders a little fuzzy, but each area block defines the plant and animal life, the temperature and rainfall, and the layers of stones that can be found in that 48x48 area. These are clumped together in like types - using the F1, F2, F3 & etc. keys you can view them all.

If you pay attention to the pre-embark map (and make notes?), you can see what layers lie below each area block, in order as they go deeper. This will help you find stone/ore you might be looking for. You can also see where any underground pool or underground river or magma might be hiding - but that's another article.

See also:

• Exploratory mining