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3.25" Gemmy Green Demantoid Garnet Cluster - Madagascar
This is a stunning cluster of lustrous green andradite var. demantoid garnets in matrix. It was collected from the Antetezambato Demantoid-Topazolite Mine in Diana, Madagascar. The garnets have gorgeous apple-green coloration that contrasts nicely against the white matrix.
About Demantoid Garnets
Demantoid is the vivid green, chromium-rich variety of andradite garnet, renowned for its exceptionally high dispersion (0.057), which produces spectral “fire” that exceeds that of diamond. First described from the metamorphosed serpentinite bodies of Russia’s Ural Mountains in the mid-19th century, it often contains radiating chrysotile “horsetail” inclusions that are both diagnostic of Russian material and valuable indicators of natural formation conditions. Additional occurrences in Namibia and Madagascar produce comparable specimens, though Ural deposits remain the benchmark for saturated coloration and classic inclusion patterns. Formed under narrowly defined temperature–pressure regimes in ultramafic and contact-metamorphic settings, demantoid’s chromium-induced color, distinctive internal structures, and remarkable optical properties make it one of the most scientifically important and visually extraordinary members of the garnet group.
Demantoid is the vivid green, chromium-rich variety of andradite garnet, renowned for its exceptionally high dispersion (0.057), which produces spectral “fire” that exceeds that of diamond. First described from the metamorphosed serpentinite bodies of Russia’s Ural Mountains in the mid-19th century, it often contains radiating chrysotile “horsetail” inclusions that are both diagnostic of Russian material and valuable indicators of natural formation conditions. Additional occurrences in Namibia and Madagascar produce comparable specimens, though Ural deposits remain the benchmark for saturated coloration and classic inclusion patterns. Formed under narrowly defined temperature–pressure regimes in ultramafic and contact-metamorphic settings, demantoid’s chromium-induced color, distinctive internal structures, and remarkable optical properties make it one of the most scientifically important and visually extraordinary members of the garnet group.
SPECIES
Andradite var. Demantoid
LOCATION
Antetezambato Demantoid-Topazolite Mine, Ambanja, Diana, Madagascar
SIZE
3.25 x 1.65"
CATEGORY
SUB CATEGORY
ITEM
#284021
