I do not have access to the current market prices of stones or minerals, and the value of Kokonga Basalt may vary depending on factors such as availability, demand, quality, and location. However, as a general rule, natural stones that are rare, have unique characteristics, or high durability are usually more valuable and expensive than common ones. Therefore, it is possible that Kokonga Basalt, a volcanic rock found in limited areas in New Zealand, may be priced higher than other types of basaltic stones or construction materials.