Lot of 5 natural Magnesite tumbled stones from Brazil

This is a lot of 5 tumbled brain-like form natural Magnesite from Brazil. Stones have dark thread of veins or a web-like matrix across its surface.
These stones are perfect for crafting, collecting, metaphysical use, or jewelry making projects.
Location: Brazil
Size: up to 2.7 Centimeters
Weigh: each lot is about 25 Grams