Shungite is a mineraloid that comes from a small village in Russia called Shunga. It's known as a crystal of grounding, detoxification, and neutralizing, and many people believe it has the ability to block emf (electromagnetic frequencies) pollutants. It's often kept near electronic devices which are high in emfs.
Merkabahs are a three dimensional star with eight points and are connected to sacred geometry and is first mentioned in the Torah. Because its geometric shapes spin in all directions, , it has the ability to create a perfectly harmonized and balanced environment.
These would make a great addition to any space that can use cleansing and grounding energy, or in areas with electronics.