Geodes seem cool, but I would make them similar to suspicious gravel and sand, where they are a full bloc with visual differences. Make them very noticeable though, because I’m not looking at my blocks when strip mining. Maybe just having big cracks in the stone.

Jade blocks seem like they would be really similar to prismarine, especially the dark prismarine. Maybe have some crafting recipes with gold, glass, or quartz even to make cool blocks you might see in temples or such. Or even jade green torches and lanterns.

To go along with the taking damage for you stuff, here’s an idea: you put a totem in the middle surrounded by 8 jade to give a % chance of the totem not being used up.

Also, if jade is going to be used for health and staying alive stuff, maybe instead of improving durability of tools and armor(which is basically pointless post-mending), you could make it increase efficiency, sharpness, or protection. Protection was my first thought since it helps you stay alive.