Ore

GregTech contains a plethora of new ores, many of which take on multiple forms, being able to be found in: both types of sand (normal and red), gravel, all types of stone (including diorite, granite and andesite) and even netherrack and endstone, alongside several different types of stone added by the mod, such as basalt.

Vanilla
GregTech can be configured to retain or disable vanilla ore generation, but will still spawn its own variants regardless. Any mods that specifically add in vanilla ore generation in any circumstances will still remain, however (E.g., Quark fairy circles spawning emerald or diamond ore).
 * Coal
 * Diamond
 * Emerald
 * Gold
 * Iron
 * Lapis Lazuli
 * Nether Quartz
 * Redstone

GregTech

 * Almandine
 * Aluminium
 * Amethyst
 * Apatite
 * Banded Iron
 * Barite
 * Bastnasite
 * Bauxite
 * Bentonite
 * Beryllium
 * Bismuth
 * Blue Topaz
 * Bornite
 * Brown Limonite
 * Calcite
 * Cassiterite
 * Certus Quartz
 * Chalcocite
 * Chalcopyrite
 * Chromite
 * Cinnabar
 * Cobalt
 * Cobaltite
 * Copper
 * Cuprite
 * Enargite
 * Enriched Naquadah
 * Galena
 * Garniertite
 * Glauconite
 * Graphite
 * Green Sapphire
 * Grossular
 * Ilmenite
 * Iridium
 * Jasper
 * Lazurite
 * Lead
 * Lepidolite
 * Lignite Coal
 * Lithium
 * Magnesite
 * Magnetite
 * Malachite
 * Molybdenite
 * Molybdenum
 * Monazite
 * Naquadah
 * Neodymium
 * Nickel
 * Niobium
 * Oilsands
 * Olivine
 * Opal
 * Osmium
 * Palladium
 * Pentlandite
 * Phosphate
 * Phosphor
 * Pitchblende
 * Platinum
 * Powellite
 * Pyrite
 * Pyrolusite
 * Pyrope
 * Quartzite
 * Red Garnet
 * Rock Salt
 * Ruby
 * Rutile
 * Salt
 * Saltpeter
 * Sapphire
 * Scheelite
 * Sheldonite
 * Silver
 * Soapstone
 * Sodalite
 * Spessartine
 * Sphalerite
 * Spodumene
 * Stibnite
 * Sulfur
 * Talc
 * Tantalite
 * Tanzanite
 * Tennantite
 * Tenorite
 * Tetrahedrite
 * Thorium
 * Tin
 * Topaz
 * Tungstate
 * Uraninite
 * Uranium 235
 * Uranium 238
 * Vanadium Magnetite
 * Vinteum
 * Wulfenite
 * Yellow Garnet
 * Yellow Limonite
 * Zinc