These may look like Hematite, but they are not. These are much lighter in weight compared to Hematite. These are Manmade gemstones called Silicon. It has a high thermal conductivity. It is known to melt ice. How cool! This is an Ore that is made by extracting Silica from sand or Quartz. Helps to clear the mind from stress and worries. And is known for helping increase circulation in the body.
Tumbled stones are smaller pieces of crystals or rocks that have been processed in a rock tumbler with water, sand and grit. Over weeks in a tumbler, the stone edges and surfaces become smooth and sometimes highly polished to bring out the beauty of the stone. The pleasing shape and size of tumbled stones make them desirable as more inexpensive and usable crystals.