Naquadah
Naquadah is a rare, super-heavy, super-dense chemical element.
Due to its unique properties, Naquadah forms the basis for many advanced technologies; the Stargates themselves are composed almost entirely of Naquadah. Weapons-grade Naquadah is so dense and heavy that 2 Jaffa are required to lift a quantity the size of a couple of common housing bricks, making it at least as dense as gold. Alternate forms of Naquadah include Liquid Naquadah, used to power Goa’uld Staff weapons.
Source: stargate.fandom.com
In Stargate Journey, Naquadah is the primary resource for further progression.
Naquadah can be found in two forms - Raw and Pure Naquadah.
Obtaining Naquadah
Naquadah ore can generate in the Nether, but mainly on Abydos. The ore is generated underground (as a standard ore) in the Abydos desert biome or more concentrated amounts in the Abydos spires.
It drops raw Naquadah and rarely pure Naquadah. This chance can be increased with Fortune enchantment.
[Spoiler] Abydos spires biome
Abydos spires biome contains stone pillars (spires) with a decent amount of Naquadah ore.
Processing Naquadah
Raw Naquadah can be processed into Naquadah Alloy, Pure Naquadah, Weapons grade Naquadah, Liquid Naquadah, and Heavy liquid Naquadah.
Processed Naquadah can then be used to craft crystals and your own Stargate.