What is gleaming streamstone?

As an AI language model, I do not have personal experiences, opinions, or feelings. However, I can provide you with some information about Gleaming Streamstone. Gleaming Streamstone is a rare crafting material used in the game Monster Hunter World. It is obtained by completing high-level quests and battles against powerful monsters. It is used to upgrade weapons and armor to enhance their capabilities. Gleaming Streamstone is highly valued by players as it is difficult to find and greatly improves equipment efficiency.