0.19 ct CREEDITE – MEXICO

Creedite

Creedite is a gemstone that captures the delicate, “explosive” beauty of the halide world. A complex calcium aluminum sulfate fluoride, it is a mineral I have always held in high regard for its stunning “hedgehog” or “pincushion” crystal sprays. While many halides are simple cubes, Creedite forms elongated, needle-like prisms that radiate from a central point, creating a geometric firework frozen in stone. It typically presents in a range of “electric” colors—from a vivid, candy-like orange to a sophisticated “misty” white or a rare, ethereal purple. For the specialist, Creedite is a stone of the rare oxidation zones, representing a unique chemical meeting of fluorine and sulfur. It is a mineral of high-frequency aesthetics, offering a “snappy,” brilliant luster that makes it a centerpiece for the systematic vault.

The Heritage & Discovery

Historical Significance: Creedite is a vital species for understanding the behavior of fluorine in the oxidized portions of ore deposits. Historically, it was a rare curiosity until the discovery of the massive, world-class pockets in Mexico during the late 20th century. In the world of fine minerals, it is celebrated for its radial symmetry and its ability to form large, aesthetic “bouquets” of crystals. It stands as a symbol of clarity and expansion, bridging the gap between common industrial fluorides and the elite world of rare, acicular collector gems. It serves as a reminder that the most extreme geological environments—where acids and gases collide—can produce the most delicate and beautiful structures.

Discovery: The mineral was first described in 1916 and was named after its type-locality: Creede, Colorado, USA. Scientifically, it is a hydrated calcium aluminum sulfate fluoride hydroxide. Its discovery in the Colorado Fluorspar Co. Mine provided mineralogists with the first clear look at a “fluorine-rich” sulfate, helping to map the chemical diversity of secondary minerals in volcanic-hosted vein deposits. Since its formal identification, it has become a “must-have” for collectors of North American and Mexican rarities.

Important Mines: The undisputed world capital for the finest, most vibrant Creedite is the Navidad Mine in Durango, Mexico. This site produced the legendary “orange” balls that set the global standard for the species. I also have a high regard for the classic white and purple specimens from the Santa Eulalia District in Chihuahua, Mexico, and the historic material from Creede, Colorado. For the vault, I prioritize the Navidad material for its unmatched “neon” color and the Santa Eulalia pieces for their exceptional crystal size and transparency.

Mineralogical Profile

Description: Creedite is a hydrated calcium aluminum sulfate fluoride hydroxide that crystallizes in the monoclinic system. It sits at a 3.5 to 4 on the Mohs scale, making it a relatively soft and fragile mineral. Its needle-like crystals are exceptionally brittle and must be handled with the utmost care to prevent the “points” from snapping. It is characterized by its vitreous luster and its range of orange, colorless, white, and purple hues.

One of its most identifying traits is its habit—it almost always forms as radiating, “hedgehog” sprays of acicular needles. It has a moderate refractive index ($n \approx 1.46$ to $1.48$), which gives the individual needles a bright, “glassy” spark when light catches the facets. Because it is a hydrated mineral, it is stable but should be kept away from harsh chemicals. When I select a piece for the collection, I look for “complete” sprays with unbroken terminations and a vibrant, even color, as these represent the species in its most perfect and high-energy form. It is a light, sophisticated mineral that offers a unique, architectural depth unlike any other halide.

Chemical Formula: Ca₃Al₂(SO₄)(F,OH)₁₀·2H₂O