The stone top is the only preserved fossil volcano in Croatia, the archaeological site of semi-precious stone - agate.
Agate is the chemical composition of quartz, and is characterized by a special beauty, which gives it a variety of material layers and their colors. The area is legally protected by the 18th March 1998. Year, as the sixth geological monument of nature in Croatia and represents the scientific, educational and tourist attraction. Year 2006. Founded the association "Lepoglava agate" which deals with research and presentation of Croatian minerals and producing and selling souvenirs of semi-precious stones. The cottage at the foot of the hill, one can see a small exhibition and agate jewelry from him.