0.62 ct OREGON SUNSTONE – USA

Oregon Sunstone

Clear Oregon Sunstone from the high-desert volcanic fields of Western North America represents the “pure-calcium-sodium” peak of the feldspar world. A gem-grade variety of labradorite plagioclase, it is a species I have always respected for its “water-clear,” “ice-like” transparency when completely devoid of copper inclusions, and its status as a masterpiece of “triclinic” structural discipline. For the specialist, a water-clear Oregon Sunstone is a prize of flawless magmatic crystallization; it offers a vitreous luster and a “luminous” presence that makes it a true “high-vibration” asset for the systematic vault. As an artist, I find the “aqueous” depth and the “razor-sharp” optical clarity of these colorless to pale-champagne crystals to be one of nature’s most sophisticated and “ethereal” palettes.

The Heritage & Discovery

Historical Significance Oregon Sunstone is a vital species for understanding the complex crystallization of plagioclase feldspars within basaltic lava flows. Historically, while indigenous peoples collected these stones for centuries, it wasn’t until the 20th century that the unique deposits in Oregon gained global mineralogical recognition, culminating in it being named the official state gemstone in 1987. In the world of fine minerals, while the red and green copper-bearing varieties grab headlines, the completely clear, facet-grade material is celebrated for its natural, “pure-crystal” brilliance, which stands as a symbol of mental clarity and structural integrity. It serves as a reminder that the same volcanic forces that produce intense color can also yield pockets of absolute, unblemished transparency.

Discovery While labradorite is found globally, the “gem-grade” discoveries in Oregon redefined the mineralogical benchmark for the plagioclase group due to the unique presence of elemental copper in the volcanic basin. Scientifically, it is a calcium-rich plagioclase feldspar. Its discovery in the remote Lake County and Harney County deserts provided mineralogists with the first clear look at the species’ potential for large, water-clear crystals that form as phenocrysts within the basalt matrix. My own respect for this material grew from observing its “optical” purity; specifically, the way a completely clear crystal handles light—devoid of the typical “shiller” or cloudiness found in standard feldspars—presents a visual impact that is unmistakable to the trained eye.

Important Mines The undisputed world capital for the finest “aesthetic” Oregon Sunstone is the Plush area in Lake County, Oregon, USA, home to legendary operations like the Dust Devil Mine, the Spectrum Mine, and the Ponderosa Mine. These specimens set the global benchmark for crystal clarity and “sharp” crystalline architecture, often found weathered out of the volcanic host rock into the surrounding desert soil. For the vault, I prioritize the water-clear crystals from these specific high-desert localities for their unmatched “aqueous-purity” and their status as a rare-purity masterpiece of North American volcanic mineralogy.

Mineralogical Profile

Description Oregon Sunstone is a calcium-sodium aluminum silicate that crystallizes in the triclinic system. It sits at a 6 to 6.5 on the Mohs scale, making it a durable mineral, though its perfect cleavage in two directions means it must be handled and fashioned with expert lapidary care to preserve its “razor-sharp” edges and vitreous surfaces. It is characterized by its vitreous luster and its unmistakable, “water-clear to pale-straw-yellow” color palette when completely free of copper.

One of its most identifying traits is its triclinic twinning and its specific gravity (SG approx 2.68 to 2.72) which reflects its framework silicate structure. It possesses a refractive index running from approximately 1.56 to 1.57, offering a soft, bright internal reflection. Because it forms during the cooling of basaltic lavas, it is often found as isolated crystals or embedded directly within dark basalt matrix. When I select a clear piece for the collection, I look for absolute “water-white” transparency and an absence of micro-fractures, as these highlight the sophisticated, three-dimensional geometry of the mineral’s undisturbed growth. It is a light, high-vibration mineral that offers a unique, “aqueous-neon” beauty unlike any other feldspar variety.

Chemical Formula (Ca,Na)(Al,Si)4O8 (Typically 50-70% Anorthite, 30-50% Albite)