This collection displays a diverse array of geological rock and mineral specimens, each presented on a reddish-brown wooden display base, lending the collection high educational and geological value. The collection features principal samples from the major rock classes—igneous, sedimentary, and metamorphic—collectively representing the natural geological richness of Indonesia. One of the key specimens is Granite, an igneous rock characterized by its coarse texture and speckled pattern of Quartz, Feldspar, and Mica, which is common throughout the Archipelago. There is also Limestone, a sedimentary rock appearing light to dark grey with a finer texture, abundant in Java and Sulawesi. The most striking specimen is Obsidian, a dark black volcanic igneous rock with a glassy texture, often found in active volcanic areas. The collection also includes appealing mineral specimens, such as a Quartz or Amethyst variant showing a pale purple hue. Other sedimentary/metamorphic rock specimens exhibit reddish-brown, cream, and grey colors, likely Quartzite, Sandstone, or other metamorphic rocks commonly encountered in the highlands and mountains of Indonesia.