Rancid Golbin Den

so unfortunately temperature doesn't just magically make something knappable

even excluding those materials which do not have a solid form, not all solid materials undergo sufficient embrittlement at low temperatures

and even excluding those materials that do not become brittle when cold, not all brittle materials exhibit conchoidal fracture

ultimately thats the property we are looking for here, materials that do not possess strong preferential cleavage and fracture directions and can therefore be fractured conchoidally are those considered knappable

now this is an Incredibly large group materials still, nearly every brittle amorphous material and nearly everything with a glass transition temperature is potentially included, making almost all plastics a potential option

but even crystals display conchoidal fracture so long as their crystal structure doesnt produce definite preferential fracture and cleavage planes, I've been hoping to try out some larger specimens of synthetic ruby or cubic zirconia for their knappability at some point, since they both exhibit some conchoidal fracture

Teuthida Abyssalis