Stone wool, also known as mineral wool or rock wool, is made from volcanic rock such as basalt or diabase. Here is a general process of how stone wool is made.

     1. Melting: Basalt or diabase rock is heated in a large furnace at over 1500 degrees Celsius.
     2. Spinning: The molten rock is centrifugally spun to create fine fibers. Different methods can be used, including centrifugal spinning or the "high-speed centrifugation" technology.
     3. Binding: Binders, usually made of materials, are added to the spinning process to hold the fibers together.
     4. Forming: The fibers are collected and formed into mats or slabs by a process known as carding.
     5. Curing: The formed mats or slabs are then cured in an oven at high temperatures strengthen the binders and further solidify the material.
     6. Cutting: The cured stone wool is cut into desired sizes and shapes for various applications, such as insulation boards, blankets..
     The properties of stone wool, such as its high thermal and acoustic insulation properties, are from the fine fibers and air pockets trapped within the material. Stone wool is widely used for insulation in buildings, horticulture, and industrial applications.