Taketomi is one of only two islands in Japan (the other is Iriomote) that accumulate this 'sand' formed from the shells of thousands of tiny crustaceans. While Star Sand Beach (星砂の浜 Hoshizuna-no-hama) usually refers to the more accessible Kaiji, you can also find the stuff at the rarely visited Aiyaruhama (アイヤル浜) near the Hoshinoya resort. Bear in mind that people are not allowed to take the sand: you must pick the individual stars.