0.25 ct Chrome Fluoro-Pargasite Amphibole – Mogok – MYANMAR

Chrome Fluoro-Pargasite Amphibole (Ultra-Rare)

Chrome Fluoro-Pargasite represents the “neon-emerald” peak of the complex amphibole world. A rare, chromium-rich variety of the pargasite series, it is a species highly respected for its “electric” intensity and its status as a significant rarity among the Mogok treasures. While common Pargasite can be attractive, the specific addition of chromium and fluorine in the lattice creates a “vibrant” green that feels almost impossible in a silicate structure. For the specialist, Chrome Fluoro-Pargasite is a prize of geochemical concentration; it offers a vitreous luster and a “liquid” brilliance that makes it a true “high-saturation” asset for the systematic vault.

The Heritage & Scientific Discovery

Historical Significance: Chrome Fluoro-Pargasite is a vital species for understanding the interaction between deep-seated metamorphic fluids and chromium-rich host rocks. Historically, it was often misidentified as fine Emerald or Chrome Diopside until precise mineralogical analysis (Ref: Day et al., 2019) revealed its unique “fluorine-dominant” amphibole structure. In the world of fine minerals, it is celebrated for its natural, neon-green glow. It stands as a symbol of chemical harmony, bridging the gap between common rock-forming minerals and the elite world of “hyper-saturated” precious gems.

Structural Rarity: The mineral series was formally named after its type-locality in Pargas, Finland, but the Chrome-Fluoro variety found its ultimate expression in Southeast Asia. Scientifically, it is a member of the calcium amphibole group. Its discovery in the marble-hosted deposits of Mogok, Myanmar provided mineralogists with the first clear look at how fluorine and chromium can stabilize a crystal to produce “gem-grade” transparency. Because of the fluorine content, the crystals possess a superior clarity and “crispness” compared to standard pargasites, allowing for faceted gems that look “alive” even in low-light conditions.

Important Mines: The undisputed world capital for the finest, “neon-green” Chrome Fluoro-Pargasite is the Mogok Stone Tract in Myanmar. These Burmese specimens set the global benchmark for color saturation and crystalline “fire.” While high-quality crystals are found in the Badakhshan region of Afghanistan, the Myanmar material remains the primary choice for the systematic vault due to its unmatched “chromatic-vibrance” and legendary status among the rarest Burmese silicates.

Mineralogical Profile

Technical Description: Chrome Fluoro-Pargasite is a complex silicate crystallizing in the monoclinic system. It sits at a 5.5 to 6 on the Mohs scale, making it a durable collector’s gem, though its characteristic amphibole cleavage requires a master’s touch to facet. It is identified by its strong pleochroism, shifting between shades of bright green and yellowish-green, and its specific 110 cleavage at 56° and 124°.

It has a refractive index of n  1.630 to 1.660 and a specific gravity of SG  3.0 to 3.2. Often found in association with Mogok Calcite, Spinel, and Phlogopite, this specimen represents an “eye-clean” transparency that highlights the sophisticated, three-dimensional geometry of the mineral’s growth. It is a high-vibration mineral that offers a unique, “electric-green” beauty unlike any other amphibole species.

Chemical Formula: NaCa₂(Mg₄Cr)(Si₆Al₂)O₂₂F₂