All The Ores

As of writing, this addon adds around 32 new ores that all exist in real life, including...

Ruby, Sapphire, Sulfur, Celestite, Azurite, Autunite, Magnesite, Alexandrite, Malachite, Crocoite, Graphite, Talc, Silver, Bauxite/Aluminum, Dioptase, Red Beryl, Aquamarine, Pitchblende, Opal, Topaz, Turquoise, Adamite, Amethyst [an easier way to get amethyst shards], Sunstone, Spinel, Tanzanite, Demantoid, Pyrope, and Almandine 

It also adds new stone types. The new stone types are slate, marble, limestone and pegmatite. Pegmatite is the host rock for most of the ruby and sapphire you will find. The stone and deepslate variants are rare. You can polish and make bricks with marble, limestone and slate but right now pegmatite's only use is for getting quick rubies. 

Here is a quick guide on some ores' Y levels:

Alexandrite, tanzanite, spinel, sustone, demantoid, almandine, peridot, opal, pyrope, and spessartine: 16 to -64

Ruby and sapphire: 32 to -64

Topaz: 16 to 0

Pitchblende: -40 to -64

Rhodocrosite, amethyst, turquoise and azurite: 64 to -64

All Fluorite variants: 16 to -64

Magnesium: -64 to 100

Adamite: 32 to -64

Some photos: 

[new spinel and amethyst ore textures in 2.0.3, replaced the original textures that were made using mcreator's stamp feature]

A look inside a cave in 2.0.3

A look inside a cave in 2.1.1.

If you have any suggestions for new ores, make sure to lmk in the comments! Also, the platform i'm making this mod with [Mcreator], is a little finicky and i can't add stuff like tools or armor right now.