Fun fact: Assuming there's a cluster in every possible position and the layers stones are distributed more-or-less evenly, microcline, mica, and orthoclase are each twice as common in metamorphic areas as slate. Yes, they're clusters and slate is a layer stone, but each of those can occur in any metamorphic layer, and slate can only occur in 1/6 of the layers.
Microcline is similarly common in other regions, too. The least common non-sedimentary stone in the game is horn silver, by far, and I may leave it out of the regional coral entirely - microcline tends to be several thousand times more common than horn silver, which will be really, really annoying to set up.
Edit-to-add:
I have the proportions for the regional corals calculated, without including gems, because as it turns out including gems in them won't work very well. I actually wound up doing some pretty complicated math, based on the assumption of each embark square having 1000 squares of layer stone, a 1000-square randomly chosen large cluster, two 150-square randomly chosen veins that occur in the given layer stone or cluster, and 10 6-square small clusters, four of which are associated with the layer stone, four of which are associated with the large cluster, and two of which are associated with the veins. (Yes, this totals to about 60 more squares than are in an actual embark square. It's close enough. Round numbers are good.) I then worked out the relative frequency of each kind of stone that can occur in each layer, and, by extension, each region.
The numbers work out as follows:
For every 100 squares of gneiss, you'll get
- 100 squares of marble
- 100 squares of phyllite
- 100 squares of quartzite
- 100 squares of schist
- 100 squares of slate
- 200 squares of mica
- 200 squares of microcline
- 200 squares of orthoclase
- 40.5 squares of cobaltite
- 40.5 squares of galena
- 40.5 squares of sphalerite
- 40.5 squares of tetrahedrite
- 6 squares of native silver
- 6 squares of malachite
- 6 squares of cinnabar
- 11.18 squares of hornblende
- 11.18 squares of rutile
- 11.18 squares of graphite
- 1.2 squares of calcite
- 1.2 squares of perclase
- 0.06 squares of horn silver (will not be included)
For every 100 squares of andesite, you'll get
- 100 squares of basalt
- 100 squares of dacite
- 100 squares of obsidian
- 100 squares of rhyolite
- 250 squares of alunite
- 250 squares of microcline
- 25 squares of cinnabar
- 25 squares of galena
- 25 squares of hematite
- 25 squares of native copper
- 25 squares of native gold
- 25 squares of tetrahedrite
- 4.29 squares of brimstone
- 4.29 squares of hornblende
- 4.29 squares of native aluminum
- 4.29 squares of opriment
- 4.29 squares of pyrolusite
- 4.29 squares of realgar
- 4.29 squares of stibnite
For every 100 squares of diorite, you'll get
- 100 squares of gabbro
- 100 squares of granite
- 116.67 squares of orthoclase
- 116.67 squares of microcline
- 33.33 squares of olivine
- 33.33 squares of mica
- 20.29 squares of cobaltite
- 20.29 squares of tetrahedrite
- 20.29 squares of native gold
- 5.29 squares of garnerite
- 5.29 squares of kimberlite
- 5 squares of cassiterite
- 5 squares of galena
- 5 squares of native silver
- 1.76 squares of chromite
- 1.76 squares of native platinum
- 6.09 squares of hornblende
- 6.09 squares of pyrolusite
- 1.93 squares of ilmenite
- 0.01 squares of serpentine (will not be included)
- 1.16 squares of cryolite
- 1.16 squares of pitchblende
- 1.16 squares of rutile
- 0.2 squares of horn silver (will not be included)
For every 100 squares of chalk, you'll get
- 100 squares of chert
- 100 squares of claystone
- 100 squares of conglomerate
- 100 squares of dolomite
- 100 squares of limestone
- 100 squares of mudstone
- 100 squares of rock salt
- 100 squares of sandstone
- 100 squares of shale
- 100 squares of siltstone
- 176.79 squares of bauxite
- 176.79 squares of gypsum
- 176.79 squares of jet
- 176.79 squares of kaolinite
- 176.79 squares of magnetite
- 176.79 squares of microcline
- 14.29 squares of puddingstone
- 13.03 squares of borax (vein plus small cluster)
- 12.5 squares of sylvite
- 60.69 squares of bituminous coal
- 60.69 squares of hematite
- 60.69 squares of lignite
- 60.69 squares of limonite
- 60.69 squares of tetrahedrite
- 8.39 squares of native platinum
- 4.2 squares of galena
- 4.2 squares of malachite
- 4.88 squares of native copper
- 4.88 squares of cinnabar
- 29.48 squares of petrified wood
- 29.48 squares of saltpeter
- 0.53 squares of alabaster
- 0.53 squares of anhydrite
- 0.53 squares of brimstone
- 0.53 squares of satinspar
- 0.53 squares of selenite
- 1.06 squares of alunite
- 1.06 squares of marcasite
- 0.8 squares of calcite
As to gems, the numbers are already pretty low for most of the small cluster stones, and if I add gems, they'll be competing for those same small-cluster slots unless I re-factor everything to add more slots (which, no), so what will actually happen is that gems *and* rare stones will be too rare to show up in comparison to the more common rocks.
I'll probably still include gems in the non-region coral, but gems weren't really the point of this creature anyway, so this is fine by me.
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