Aerogels are the world's lightest, least dense solids, consisting of up to 99.8% air, and have been recognized with entries in the Guinness Book of World Records. This silica-based aerogel is hydrophobic (repels water) and has an incredibly low density. We include chunks of different sizes, with more than one between 0.5 and 1.5 inch NASA used aerogel to capture space dust in the STARDUST mission, where the aerogel gently slowed and trapping high-velocity particles of comet dust without damaging them! Our silica aerogel has an ethereal, translucent look with an opalescent, soft blue tint, resembling "frozen smoke" or a "solid cloud." Aerogel is a powerful insulator, and NASA also uses it to protect the Mars Exploration Rovers (Perseverance, Curiosity, Spirit, and Opportunity) from the harsh elements in space! This jar contains a rare class of materials known as aerogels. Often called "frozen smoke," their porous structure makes them the world's least dense solids. Their unique properties helped NASA capture space dust in the STARDUST mission. This silica-based aerogel is hydrophobic (repels water) and has fascinating optical qualities. It boasts an incredibly low density, consisting of up to 99.8% air. You'll receive about 2 oz, with several chunks ranging in size, with more than one between 0.5 and 1.5 inch. Important: Silica aerogel is a scientific material, not a toy. Do not inhale the powder, do minimize skin contact, and always wash hands after handling. Be gentle, as aerogel easily breaks into fine particles. MAGIC MATERIALS STUDIO brings you inspiration through materials! From aerogels to nitinol, smart pigments, and more, we search the material world to find high-quality, functional, and hard-to-find products.