5.40 ct PRICEITE – USA

Priceite

Priceite represents the “snow-white” purity of the borate world. A hydrous calcium borate, it is a species I have always respected for its “porcelain” texture and its rare occurrence as distinct, “chalky” nodules or masses. For the specialist, a top-tier Priceite is a prize of boron-rich concentration; it offers a dull to waxy luster and a “serene” presence that makes it a sophisticated addition to the systematic vault.

The Heritage & Discovery

Historical Significance: Priceite is a vital species for understanding the evaporation and concentration of boron in volcanic and lacustrine environments. Historically, it was an important source of borax before more massive deposits were discovered. In the world of fine minerals, it is celebrated for its natural, “bone-white” elegance. It stands as a symbol of chemical refinement, bridging the gap between common evaporites and the elite world of “rare-earth” borate collector specimens. It serves as a reminder that the most “monochromatic” minerals often possess the most complex internal chemistry.

Discovery: The mineral was formally named in 1873 in honor of Thomas Price, a San Francisco metallurgist who first analyzed the material. Scientifically, it is closely related to Colemanite and Pandermite. While the type-locality is in Oregon, USA, the discovery of world-class, “marble-like” nodules in the Sultanchair region of Turkey provided mineralogists with the first clear look at the species’ potential for “high-density” perfection. My own respect for this material grew from observing its “hidden” luminescence; under short-wave ultraviolet light, it often displays a “vibrant” yellowish or blue-white glow, revealing a hidden energy that is unmistakable to the trained eye.

Important Mines: The undisputed world capital for the finest, “porcelain-grade” Priceite is the Sultanchair (Susurluk) area in Balıkesir Province, Turkey. These Turkish specimens set the global benchmark for nodular size and purity. I also have a high regard for the historic, “chalky” finds from the Chetco River in Oregon and the “Death Valley” deposits in California, USA. For the vault, I prioritize the Turkish material for its unmatched “solid” texture and its classic mineralogical pedigree.

Mineralogical Profile

Description: Priceite is a calcium borate that crystallizes in the monoclinic system, though it is almost always found in massive or cryptocrystalline forms. It sits at a 3 to 3.5 on the Mohs scale, making it a relatively soft and delicate mineral that must be handled with care to avoid marking its “soft” surfaces. It is characterized by its dull, earthy, or waxy luster and its unmistakable, “stark-white” color palette.

One of its most identifying traits is its conchoidal to uneven fracture and its tendency to form as “compact” masses that resemble unglazed porcelain. It has a moderate refractive index and a specific gravity. Because it forms in borate-rich evaporite deposits, it is often found in association with Colemanite, Ulexite, and Gypsum. When I select a piece for the collection, I look for “pure” white color and a “glassy” edge on fractured surfaces, as these highlight the sophisticated, three-dimensional density of the material’s growth. It is a light, high-vibration mineral that offers a unique, “minimalist” beauty unlike any other borate species.

Chemical Formula: Ca₄B₁₀O₁₉ · 7H₂O