Copper is so amazing! It is both an element (Cu on the periodic table) and a mineral. It has a hardness of 2.5 to 3, so it is pretty soft. Copper is valuable because it is malleable and can conduct both...
Calcite is a common but spectacular mineral. Its formula is CaCO3, and it is a trigonal-rhombohedral mineral. This crystal structure takes on many different forms - over 300 of them! Here’s a fun fact:...
Emerald, a favorite among precious gems, is actually a variety of beryl. The pronunciation of beryl is the same as if you were saying “barrel.” Other common names for beryl include aquamarine (blue),...
