Rhodizite Jewelry and Gemstone Information

RHODIZITE: Madagascar (0.49)

RHODIZITE: Madagascar (0.49)

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.

DataValue
NameRhodizite
CrystallographyIsometric. Crystals dodecahedral or tetrahedral, up to 2 cm size; massive.
ColorsColorless, white, yellowish white, yellow, gray, rose red.
LusterVitreous to adamantine.
Density3.44.
CleavageDifficult. Fracture conchoidal. Brittle.
Dispersion0.018.
Stone SizesMadagascar material in fragments clean enough to cut has provided stones up to about 3 carats. Smithsonian Institution (Washington, D.C): 0.5 (Madagascar).
LuminescenceWeak yellowish glow in SW; strong greenish and yellowish, with phosphorescence, in X-rays.
SpectralNot diagnostic.
FormulaCsAl4Be4B11O25(OH)4

Optics: Isotropic; N=1.694.

Anomalously birefringent (may not be truly isotropic).

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.

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.

Source/Attribution: Dr. Joel Arem

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