Melanite

Big Photo

South Africa
2.45 carats
© gemselect.com

Opaque, black variety (Greek - black) of Andradite, referred to as "titanian andradite".

Melanite forms jet-black crystals with subadamantine to vitreous lustre. The material has been faceted

Melanite Gemstones by Colour

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

Melanite Gemstones by Size

This table shows distribution of Melanite 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:19.18 cts
Average:7.59 cts
Total photos:6
Do you have a larger Melanite? Why not upload a photo?
0.34ct to 2.22ct2.22ct to 4.11ct4.11ct to 5.99ct5.99ct to 7.88ct7.88ct to 9.76ct9.76ct to 11.64ct11.64ct to 13.53ct13.53ct to 15.41ct15.41ct to 17.30ct17.30ct to 19.18ct
General Information
A variety or type of:Andradite, which is a variety of Garnet Group
Chemical Formula
Ca
 
3
Fe
 
2
(SiO
 
4
)
 
3
Arthur Thomas, Gemstones (2009)
Photos of natural/un-cut material from mindat.org
Melanite Simulants
Black glass.
Physical Properties of Melanite
Mohs Hardness6.5 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Specific Gravity3.70 to 4.10
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityNone
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Melanite
Refractive Index1.855 to 1.895
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Optical CharacterIsotropic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Dispersion0.057
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Jet-black
Arthur Thomas, Gemstones (2009)
Causes of ColourBlack, various charge transfer processes and dispersed ion absorption involving Fe and Ti.
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTranslucent,Opaque
Arthur Thomas, Gemstones (2009)
LustreSubadamantine,Vitreous
Arthur Thomas, Gemstones (2009)
Crystallography of Melanite
Crystal SystemIsometric
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
HabitDodecahedral, trapezohedral
Arthur Thomas, Gemstones (2009)
Further Information
Mineral information:Melanite information at mindat.org
Significant Gem Localities
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
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