2.42 ct TOURMALINE - BRAZIL

Tourmaline (Cruzeiro Mine, Brazil)

Tourmaline from the legendary Cruzeiro Mine represents the "lithium-neon" peak of the elbaite world. A sodium lithium aluminum boro-silicate, it is a species I have always respected for its "electric-cranberry" to "vivid-indicolite" saturation and its status as a masterpiece of "trigonal" structural discipline. For the specialist, a top-tier Cruzeiro specimen is a prize of extreme pegmatitic evolution; it offers a high-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-neon" depth and the "spectral" brilliance of these crystals to be one of nature's most sophisticated and "alive" palettes.

The Heritage & Discovery

Historical Significance

Tourmaline is a vital species for understanding the concentration of rare elements in granitic pegmatites. Historically, the Cruzeiro Mine has been one of the world's most consistent producers of "gem-grade" crystals since the mid-20th century. In the world of fine minerals, it is celebrated for its natural, "neon-magenta" pigment, which stands as a symbol of emotional clarity and structural integrity. It serves as a reminder that the "extreme" geological conditions of Minas Gerais can produce extraordinary optical results when lithium and manganese are forged in the final stages of pegmatitic crystallization.

Discovery

While Tourmaline is found globally, the discoveries at Cruzeiro redefined the mineralogical benchmark for the species' "rubellite" color and crystal size. Scientifically, it is primarily the species Elbaite. The mine is world-famous for its "watermelon" zoning and its ability to produce "razor-sharp" prisms that often exceed 10cm in length. My own respect for this material grew from observing its "chromatic" depth; specifically, the way its trigonal prisms handle light—often exhibiting a "sharp" pleochroism and deep, velvety terminations that are unmistakable to the trained eye.

Important Locations

The undisputed world capital for the finest "aesthetic" Rubellite and Green Tourmaline is the Cruzeiro Mine, located in the São José da Safira district of Minas Gerais, Brazil. These specimens set the global benchmark for color purity and "sharp" crystal architecture. I also have a high regard for the spectacular finds from the nearby Jonas and Pederneira mines. For the vault, I prioritize the Cruzeiro material for its unmatched "neon-depth" and its status as a rare-location masterpiece of the Brazilian shield.

Mineralogical Profile

Description

Tourmaline from Cruzeiro is a lithium-rich silicate that crystallizes in the trigonal system. It sits at a 7 to 7.5 on the Mohs scale, making it a highly durable mineral, though its "brittle" nature and complex internal tension mean it must be handled with care to preserve its "razor-sharp" edges and vitreous surfaces. It is characterized by its vitreous luster and its unmistakable, "vivid-pink to forest-green" color palette.

One of its most identifying traits is its striated prismatic habit and its association with lithium-rich pegmatites. It has a high refractive index and a specific gravity (SG approx 3.0 to 3.1) that reflects its complex silicate structure. Because it forms in evolved pegmatitic pockets, it is often found in association with Lepidolite, Cleavelandite (Albite), and Quartz. When I select a piece for the collection, I look for "pure" transparency and the rarest "neon-magenta" saturation, as these highlight the sophisticated, three-dimensional geometry of the mineral's growth. It is a dense, high-vibration mineral that offers a unique, "aqueous-neon" beauty unlike any other silicate variety.

Chemical Formula Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)