7.7" 343g YellowGreen LIDDICOATITE TOURMALINE Polished Slice Madagascar for sale
Availability: In Stock
This polished slice of FLUOR-LIDDICOATITE TOURMALINE was cut from a crystal that came out of the famed 1948 pocket at the Anjanabonoina Mine, Ambohimanambola Commune, Betafo District, Antananarivo Province, Madagascar - the type locality for liddicoatite. The Smithsonian acquired several crystals from this pocket, which were later analyzed by Pete Dunn. In 1977 he published a paper about his discovery of the then-new tourmaline variety, liddicoatite. The slices from these crystals are not not the ultra-thin 1 mm (or less) slices which are all that is usually available in today's market; these are hefty slices, from 2 to 4 mm; the extra thickness is required for safe handling of slices of this exceptional size. All of the slices have been polished, giving each one a brilliant luster and transparent front and back surfaces to let the light shine through and reveal their luminous coloring and astonishing beauty.
Liddicoatite was named for Richard Liddicoat, a gemologist who invented the diamond grading system. Liddicoatite is found in stout hexagonal crystals with lenthwise striations, with multi-colored color zoning in triangular patterns. In 2011, the original liddicoatite type material was re-analyzed and redefined as fluor-liddicoatite (Darrell Henry et al).
The correct mineralogical term for colored internal triangles like those seen in this specimen is sectoral zoning (a formation related to the the internal morphology of crystals). This colorful phenomenon results when the chromophores (coloring agents such as iron and aluminum) are selectively distributed in different parts of the crystal while it is growing - an occurrence referred to as compositional zoning. This liddicoatite tourmaline slice is an unmistakable and remarkably aesthetic example of this rare formation, and it's an extremely beautiful example of this type of material.
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