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[Moose Fisher]

Is there an order in what type of stone/metal is located?

For example: alunite tends to occur within andensite or rhyolite ; orthoclase and microline in granite or grabbo.

I think there's adamantine in my fortress (other features was included in my location search), and I want to know where I should be digging.

[Scarpa]

Only criteria for adamantine is a mountain biome, I think.

I am fairly certain it's not tied to a specific layer or cluster of stone.

[Jim Groovester]

The wiki page on stone is an excellent place to start learning about that stuff, as well as the pages on the various ores.

[REDACTED], though, doesn't show up in any particular stone layer. It's a map feature, like an underground river or magma pipe, so it shows up regardless of the stone around it.

[Haedrian]

Also, while digging for adamntine, remember to check for

Spoiler (click to show/hide)

hidden surprises of the "Kill everyone" kind

[Moose Fisher]

Back to digging then.

Spoiler (click to show/hide)

My fort has been too successful, so I want some fun.  Either that, or I wait until the goblins mount an effective siege.

[Haedrian]

Spoiler (click to show/hide)

If you get SoFs, then you're going to have a lot of fun very quickly. Be sure to take a video so you can laugh about it later

[Albedo]

Is there an order in what type of stone/metal is located?

There is definitely a coded relationship between some stones/ores/gems and the stone/layers they are found in.  Other stones are "anywhere".

The wiki on "stone" is the place to start, or "the non-dwarf's guide to rock" (link @ top of "stone" article).

I think there's adamantine in my fortress (other features was included in my location search), and I want to know where I should be digging.

(You "think" there is?... kinda important to notice on the embark map.)

Anyway, adamantine, like a magma vent or chasm or underground river, is a "feature", and can appear anywhere appropriate.  (As mentioned above, I believe "mountain biome" is approp for adamantine).

[Tcei]

I have heard that admantine tends to be found in or near mica. This is how I discovered the hfs not 2 minutes after embarking, twas a fun if short lived fort.

[Albedo]

I have heard that admantine tends to be found in or near mica.

Nothing has been found in the game code to support that - doesn't mean it's not yet to be found.

But mica is found in metamorphic layers, which are more common near volcanic areas - so fortresses w/ both HFS and a magma source (two common features) would often have mica, and so the connection might be reinforced that way.  My current HFS has no mica anywhere near it.

[Untelligent]

As for more mundane minerals, one thing I've noticed time and time again is that veins and clusters tend to appear in large groups; if you find a vein of cassiterite, you're probably going to find a lot more cassiterite veins in the same mountain. You're also never guaranteed a specific mineral, even if you have the correct stone layers; so you're either going to get a lot of a particular mineral, or little to none of it.

[dragon0421]

The wiki page on stone is an excellent place to start learning about that stuff, as well as the pages on the various ores.

[REDACTED], though, doesn't show up in any particular stone layer. It's a map feature, like an underground river or magma pipe, so it shows up regardless of the stone around it.

I've read (and experienced on my own) that often magma bioms have different rock types than non magma bioms. Most notably, bauxite is usually not present in bioms with magma (which is why I always buy a couple dozen at embark). I've also read that hematite is present near magma, but not magnetite.

[Untelligent]

That's mostly true, actually. Igneous rock appears in areas of high volcanism, while sedimentary rock appears in areas of low volcanism. Bauxite only appears in sedimentary rock, if I remember correctly; as for iron, Magnetite and Limonite also only appear in sedimentary rock; Hematite is the only iron ore that can appear elsewhere.

Due to the lack of bauxite and difficulty of finding iron in areas with magma, you're going to have to find an area of high volcanism near an area of low volcanism, which can be tricky (but not necessarily impossible) without mucking around with worldgen.

[Moose Fisher]

Well, I've got a magma pipe and I'm digging all around it.  The going is a bit slow due to the size of my fortress (just reached 200 dwarves). 

If adamantine is on my map, it's going to be around there.

[Albedo]

If adamantine is on my map, it's going to be around there.

How do you figure? 

When people (above) say "mica is found close to a magma vent", they're talking about area blocks, which are found on the "Local" map during embark.  HFS is often many area blocks away from the vent, far enough even to prevent a 6x6 map from encompassing both (or both and the river/other feature you want.)

[Byakugan01]

Just do exploratory mining. You'll find it sooner or later, and it's more efficient by far than mass digging. Even more efficient is combining that with show other:ALWAYS in the init text.