Let's go over the error list, that seems like a productive thing to do when making decisions.
here's the stone
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - PERICLASE
Periclase is a magma safe stone that shows up in pockets in marble. I'm pretty sure it's safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - PERICLASE
Not sure why it's duplicated though.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - KAOLINITE
Kaolinite is for making porcelain, these stones vein within it, Marcasite, Alunite, and Turquoise, none of which have a real purpose in vanilla. In civforge, alunite is one of the stones you can use to make alum, which is used a great deal in the alchemy system, but there are two other stones that also can be used. I'd say it's probably safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - BORAX
Borax is a cluster stone that does nothing in df, safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - KIMBERLITE
Kimberlite is where diamonds form, and also the magic gems in civforge. I was wondering why I couldn't find any in the ground.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - PUDDINGSTONE
Useless rock that shows up in clusters. Safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - TALC
Cluster stone with no purpose in df, safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - ALUNITE
Shows up in Kaolinite, magmasafe, In civforge, alunite is one of the stones you can use to make alum, which is used a great deal in the alchemy system, but there are two other stones that also can be used. probably safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - CHROMITE
Chromite contains demantoid gemstones and native platinum. In real life it's the sole ore of chromium. Seems mildly important
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - MICA
No real purpose, safe to remove.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - MICROCLINE
Shows up everywhere, was originally intended to be jail for HFS, has no real use except for making cool colored stonework, for which, I often use it. Contains frost crystals from civforge, probably safe to remove, don't know if I would though.
CRYSTAL_ROCK: Environment Spec Stone Not Found, Token - KAOLINITE
AMAZONITE: Environment Spec Stone Not Found, Token - MICROCLINE
so amazonite from civforge shows up in microcline, civforge wiki say's it's supposed to be gemstone quality microcline. probably safe to remove
FIREHEART: Environment Spec Stone Not Found, Token - KIMBERLITE
CRYSTAL_STORM: Environment Spec Stone Not Found, Token - KIMBERLITE
CRYSTAL_WARD: Environment Spec Stone Not Found, Token - KIMBERLITE
CRYSTAL_FROST: Environment Spec Stone Not Found, Token - MICROCLINE
CRYSTAL_FLARE: Environment Spec Stone Not Found, Token - KIMBERLITE
These fancy gems aren't working because the stone they spawn in is gone, no big deal.
NIGHTSTONE: Environment Spec Stone Not Found, Token - ALUNITE
Bright blue decorative stone found in alum, safe to remove.
LEPIDOLITE: Environment Spec Stone Not Found, Token - MICA
ZINNWALDITE: Environment Spec Stone Not Found, Token - MICA
MUSCOVITE: Environment Spec Stone Not Found, Token - MICA
PHLOGOPHITE: Environment Spec Stone Not Found, Token - MICA
Types of mica added to civforge. They really exist. Safe to remove.
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_RED
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_RED
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_BLACK
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_BLACK
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_WHITE
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_WHITE
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_TAN
ROCK_SALT_DEPOSIT: Environment Spec Stone Not Found, Token - SAND_TAN
I wasn't aware you could find sand in rock salt. cool beans.
MELANTERITE: Environment Spec Stone Not Found, Token - ILMENITE
This indicates ilmenite isn't working. Melanterite is for alchemy, ilmenite is iron titanium dioxide, for some reason that makes it a good candidate for use in crucible steel in the mod (not in real life though, Iron sand, or a purer iron ore works way better)
Other stuff that isn't functioning from the reactions list
*** Error(s) finalizing the reaction MAKE_SALTPETER
Unrecognized Inorganic Token: SALTPETER
*** Error(s) finalizing the reaction MAKE_QUICKSILVER
Unrecognized Inorganic Token: CINNABAR
*** Error(s) finalizing the reaction MAKE_MIDNIGHT_ELIXIR
Unrecognized Inorganic Token: COBALTITE
*** Error(s) finalizing the reaction MAKE_ANTIMONY
Unrecognized Inorganic Token: STIBNITE
*** Error(s) finalizing the reaction MAKE_EMEN_AREN_FROM_VITRIOL
Unrecognized Inorganic Token: SALTPETER
*** Error(s) finalizing the reaction MAKE_EMEN_AREN_FROM_ALUM
Unrecognized Inorganic Token: SALTPETER
*** Error(s) finalizing the reaction WOOTZ_STEEL_MAKING
Unrecognized Inorganic Token: ILMENITE
Not sure why these minerals aren't present, but they are breaking the alchemy and crucible steel workshops, because these reactions don't work, So that's probably important somehow.
See you folks later, I gotta go write more PHP.