Crystallography: Isometric. Crystals dodecahedral or tetrahedral, up to 2 cm size; massive.
Colors: Colorless, white, yellowish white, yellow, gray, rose red.
Luster: Vitreous to adamantine.
Cleavage: Difficult. Fracture conchoidal. Brittle.
Optics: Isotropic; N=1.694.
Anomalously birefringent (may not be truly isotropic).
Spectral: Not diagnostic.
Luminescence: Weak yellowish glow in SW; strong greenish and yellowish, with phosphorescence, in X-rays.
Occurrence: A pegmatite mineral with few noteworthy localities.
Antandrokomby, Madagascar (and other localities in that country): yellowish and greenish crystals, some gemmy. Near Mursinsk, USSR: rose red color.
Stone Sizes: Madagascar material in fragments clean enough to cut has provided stones up to about 3 carats.
Smithsonian Institution (Washington, D.C): 0.5 (Madagascar).
Comments: Rhodizite is quite a rare mineral, and only Madagascar has produced gem-quality crystals. Faceted gems are extremely rare and usually pale in color. The mineral is rather hard and stones would be excellent for jewelry, especially since there is no cleavage.
Name: From the Greek for to be rose-colored because it imparts a red color to the flame of a blowpipe.
The IGS gratefully acknowledges Dr. Joel Arem for generously allowing us to utilize his content above with attribution.