Editing Stilbite (section)

== Physical and optical properties ==
The color is usually colorless or white, also yellow, brown, pink, salmon, orange, red, green, blue or black.  The [[Lustre (mineralogy)|luster]] is generally vitreous, and on the perfect [[Cleavage (crystal)|cleavage]] parallel to the plane of symmetry it is markedly pearly. The [[Streak (mineralogy)|streak]] is white and crystals are transparent to translucent.  The [[Mohs hardness|hardness]] is {{frac|3|1|2}} to 4 and the [[specific gravity]] 2.12 to 2.22.  [[Cleavage (mineralogy)|Cleavage]] is perfect  on {010}, poor on {001}.<ref name=ZW/>  The mineral is brittle, with a conchoidal or uneven [[Fracture (mineralogy)|fracture]].  It is not radioactive.

Stilbite is biaxial (-) with [[Refractive Index|refractive indices]]:
*Nx = 1.479 to 1.492, Ny = 1.485 to 1.500, Nz = 1.489 to 1.505<ref name=ZW/><ref name=WebminCa/>
*Nx = 1.484 to 1.500, Ny = 1.492 to 1.507, Nz = 1.494 to 1.513<ref name=MindatCa/><ref name=HOM/>