Stilbite is a mineral belonging to the zeolite group, characterized by its unique crystal structure and chemical composition. Its name is derived from the Greek words "stilbein," which means "to shine," and "lithos," meaning "stone," referencing its lustrous appearance when freshly exposed or in certain lighting conditions.
Chemically, stilbite is a hydrated calcium aluminum silicate, with the formula CaAl2Si7O18·7H2O. It typically occurs as translucent to opaque, often vitreous crystals that are prismatic, bowtie-shaped, or lamellar. These crystals can be found in a variety of colors, including white, colorless, yellow, pink, peach, brown, or red. Stilbite has a relatively low hardness on the Mohs scale, ranging from 3.5 to 4.5.
Stilbite is primarily found in hydrothermal deposits, cavities in volcanic rocks, and occasionally in basaltic rocks. It is commonly associated with other minerals of the zeolite group, such as heulandite, laumontite, and apophyllite.
Due to its unique crystal structure, stilbite has attractive optical properties, making it a sought-after mineral for collectors and lapidary purposes. Additionally, it has various industrial uses, including as a molecular sieve or a catalyst in chemical reactions. Its ability to selectively adsorb certain molecules makes it valuable in separation processes.
Stilbite crystals are appreciated for their aesthetic appeal, often forming beautiful and intricate pieces when displayed in mineral collections or used in jewelry making.
