Mineral Overhaul: Shellstone & Tuff

Blocks

Most blocks like Tuff Tiles/Hardened Tuff will be crafted with the stonecutter to avoid compatibility issues

Shellstone

the new Raw Shellstone block will spawn near beaches and can be right-clicked with an axe to harvest its shells and turn into a pearly stone.

Raw Shellstone can also be obtained with lily pads, kelp, sand, and seagrass.

Tuff

A few tuff variants have been added, You can make these in the Stonecutter with normal tuff.   

Items

Seashell

Sometimes obtained by cleaning Raw Shellstone with an axe.

Plays some familiar sounds

Can be used as an Armour Trim material for a sandy aesthetic.

Shell Template

The shell template can be used with Seashells to get a new design You can get these rarely from Raw Shellstone scraping.

Covering almost all of the armour, the Shell Template can only be used with Seashells. As otherwise, that could cause some issues with figuring out what other players wear.

Netherite Cutlass (Cosmetic)

The Netherite Cutlass Cosmetic Item can be obtained by crafting a Netherite Sword together with a Nautilus Shell. However, it can also be right-clicked or shift-clicked to play a few sounds (works with shields). It has the same properties as the Netherite Sword.