A fun mineral box – Christmas is just around the corner, and the countdown has begun. From December 1st to 24th, a different mineral is hidden behind each door of this puzzle box. New surprises await every day! The 2021 Advent calendar for adults helps you learn about and identify the individual rock, gemstone, and mineral types in the collection. It can also be used as a countdown calendar. This surprise box contains 24 minerals in various colors and shapes. 2021 Calendar. This surprise box contains 24 ornaments in different colors and shapes. PROMOTES COUNTING AND PLAYING - You can use the advent calendar ornaments to practice numbers and counting skills with your little one! Elegant Packaging - The box has always attracted children's attention and is a perfect Christmas gift that adds a festive atmosphere! Perfect Gift - This toy set is suitable as a Christmas gift, children's birthday gift, everyday gift, school prize, preschool supplies, teaching aids, parent-child interaction,