Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Easily soluble in cold dilute HCl
Good in two directions parallel to the prism faces {110}
Subconchoidal, Conchoidal
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.