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[LuuBluum]

Well, this one might have me a bit stumped because I can't see why this is the case, even in the game's files. Went and did my initial bit on any embark and dug straight to the cavern after saving just to see how deep I could go. Inside the marble walls I see... a cluster of ruby, sapphire, and diamonds. I don't see any indication of any of these gems being able to appear like this. On a previous embark I noticed the same.

Maybe one of the changes to promote going to the caverns is the spawning of rare gemstones in clusters outside of the usual environs?

[A_Curious_Cat]

After checking the wiki (and noting a redlinked image in the article for ruby), it appears that none of those gemstones should be appearing in a matrix of marble.  If so, it’s not really something I’m in favor of as I consider it to be unrealistic.

[Shonai_Dweller]

Which are the gems referred to in the marble description?
"It also frequently contains a wide variety of gems."

[A_Curious_Cat]

Which are the gems referred to in the marble description?
"It also frequently contains a wide variety of gems."

According to the wiki:

Lapis Lazuli
Melanite
Tsavorite
Heliodor
Red Grossular
Red Beryl
Alexandrite
Morganite
Cinnamon Grossular
Honey Yellow Beryl
Golden Beryl
Topazolite
Yellow Grossular
Goshenite
Cat’s Eye
Aquamarine
Chrysoberyl

And…

Emerald

[LuuBluum]

Yeah, it's very much not something in either the raws prior to this update, or even the raws after this update. I don't know what's causing them to appear, but it also seems very infrequent. I didn't pay too much attention, but I don't think the previous embark even had the cluster in marble. I think it was some other layer stone.

Notably, in both cases I only saw one cluster.

[Salmeuk]

you know . . . I think the mineral scarcity was game-ified . Or at least suspect as much.

I generated a custom world with 800 mineral scarcity, which in the past resulted in a fair amount of veins and clusters, but only in the usual expected places. However I am finding large veins of limonite and magnetite fairly deep in the ground, whereas before they were limited to the surface layers.

I too find this concerning because hell. Half the personality of DF worldgen vs. Minecraft-alikes was the realistic geology. .

has anyone noticed changes to aquifers as well? I cannot tell if I am merely unlucky or what but this last embark had a strange 7 z-level aquifer like 15 z-levels down from where you might expect to find one

[LuuBluum]

Nah, the ore distribution seems normal to me, but I think the value scale was changed. I turned mineral frequency to sparse, and I'm definitely finding only one or two metals per embark, and iron strictly in the sedimentary layers. There are definitely (at least under these settings) embarks that I've seen with no iron at all. Some even with no metals.

As for aquifers, I think that's just because certain sedimentary layers like conglomerate can have aquifers, and oftentimes do so even in mountain ranges. Every time I've seen an aquifer a good ways down, it's because it's an aquifer in conglomerate.

[LuuBluum]

Notably, taking a closer look it also seems that the cluster of gems isn't in the layer stone at all, but a small chunk of obsidian.

[A_Curious_Cat]

Ruby and sapphire (including “star” varieties) should both be in bauxite (which should be found in sedimentary layers).  Diamonds should be in kimberlite (which should be found in gabbro).  Again, according to the wiki…

[LuuBluum]

Yep. Even according to the raws of the Steam release. I have no idea what's going on with this.

[LuuBluum]

Did a bit of research and it seems that there are some cases of ultramafic volcanic rock that can contain both diamonds and adjacent rubies/sapphires that also happen to appear as small intrusions. So, if nothing else, it's not wholly unrealistic. I just wish I could find what's causing this behavior.

[Salmeuk]

hmm it is very possible it is one of the hidden changes done to mineral generation. AFAIK there were a number of passes done over nearly every part or feature of the game to prepare it for the release, and it is possible that Tarn saw fit to finalize certain details lacking in previous versions.

like how we FINALLY got giant bark scorpions back in the game after YEARS. I had honestly thought I imagined them for the longest time only to read on these forums about that bug .

[A_Curious_Cat]

Did a bit of research and it seems that there are some cases of ultramafic volcanic rock that can contain both diamonds and adjacent rubies/sapphires that also happen to appear as small intrusions. So, if nothing else, it's not wholly unrealistic. I just wish I could find what's causing this behavior.

That article only mentions diamonds in one of it’s references (and even then it mentions them in conjunction with kimberlite).  It doesn’t mention sapphire or ruby at all.

[LuuBluum]

Did a bit of research and it seems that there are some cases of ultramafic volcanic rock that can contain both diamonds and adjacent rubies/sapphires that also happen to appear as small intrusions. So, if nothing else, it's not wholly unrealistic. I just wish I could find what's causing this behavior.

That article only mentions diamonds in one of it’s references (and even then it mentions them in conjunction with kimberlite).  It doesn’t mention sapphire or ruby at all.

Yeah, that bit is in the page for corundum in general.

[A_Curious_Cat]

Hmm… so, it appears that corundum (including ruby and sapphire) can appear in lamprophyre and diamonds can appear in lamproite.  While both are types of ultrapottasic igneous rock, I think it should be pointed out that they are not the same thing.  In any case, marble is not lamprophyre nor lamproite (nor is it any other type of ultrapottasic igneous rock), so I’m not really following why you think that diamonds, sapphires, and rubies should appear in it.