Rhodizite

Big Photo

Madagascar
0.80 carats
© Rarestone.com

Rhodizite is named from Greek "rhodizein" - rose-coloured, alluding to the red tinges it gives in a blowpipe flame.

Rhodizite is found as well-formed transparent to translucent colourless to white, sometomes pink, red, yellow-green, yellow, grey crystals.

Rhodizite has a high lustre and hardness, but it is very rare and crystals are usually too small to facet. Faceted stones exceeding 1 carat are uncommon.

Rhodizite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 

Rhodizite Gemstones by Size

This table shows distribution of Rhodizite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.34 cts
Heaviest:0.80 cts
Average:0.48 cts
Total photos:5
Do you have a larger Rhodizite? Why not upload a photo?
0.34ct to 0.39ct0.39ct to 0.43ct0.43ct to 0.48ct0.48ct to 0.52ct0.52ct to 0.57ct0.57ct to 0.62ct0.62ct to 0.66ct0.66ct to 0.71ct0.71ct to 0.75ct0.75ct to 0.80ct
General Information
Chemical Formula
(K,Cs)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Rhodizite Treatments
Irradiation of colorless stone produces intense yellow-(greenish): irradiated and natural color fade on long exposure to sunlight - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 3
Physical Properties of Rhodizite
Mohs Hardness8 to 8.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity3.34 to 3.44
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityDistinct
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Rhodizite
Refractive Index1.684 to 1.694
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterIsotropic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Anomalous double refractionMore from other references
BirefringenceAnomalous
Michael O’Donoghue, Gems, Sixth Edition (2006) Frequently displays anomalous birefringence
DispersionNil
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Colourless, pink, red, yellow-green
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreAdamantine,Vitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Yellowish to greenish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Fluorescence (Short Wave UV)Weak to moderate yellow-green
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Fluorescence (X-RAY)Some specimens give a strong greenish or yellowish response with some phosphorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Rhodizite
Crystal SystemIsometric
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitDodecahedra and tetrahedra
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Geological Environment
Where found:Rhodizite occurs as a late-stage accessory mineral in alkali-rich granite pegmatites.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Inclusions in Rhodizite
"Fingerprints", thin needles, growth zoning - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 3
Further Information
Mineral information:Rhodizite information at mindat.org
Significant Gem Localities
Madagascar
 
  • Amoron'i Mania
    • Ambositra
      • Sahatsiho Ambohimanjaka
        • Manandona Valley
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 443
  • Analamanga
  • Vakinankaratra
    • Betafo
      • Anosiarivo Manapa
        • Antsentsindrano
Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871; [Eur.J.Min 13:159-165];
Russia
 
  • Sverdlovsk Oblast
    • Beryozovsky
      • Sarapulka
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 443
    • Rezhevsky District
      • Shaitanka District
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 443
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