Tilasite is a rare mineral that belongs to the silicate group and is classified as a borosilicate mineral. It was discovered in 1987 and is named after the locality of its discovery, near Tilas, in Chiapas, Mexico.
Chemically, tilasite is composed of a combination of boron, magnesium, aluminum, silicon, and oxygen atoms. Its chemical formula is (Ca,Na)[MgB2Si2O9(OH)2]. It forms as tabular, platy, or prismatic crystals that are typically found in schistose rocks, often associated with other minerals like muscovite, tourmaline, and quartz.
Tilasite is characterized by its distinct physical properties. It has a vitreous to pearly luster and exhibits a white to grayish-white color. Its hardness ranges from 5 to 5.5 on the Mohs scale, making it relatively durable but still susceptible to scratching. It has a perfect cleavage on the {001} plane.
Besides its aesthetic appeal, tilasite does not have any significant commercial applications due to its scarcity. However, its rarity and unique crystal habit make it of interest to mineral collectors and enthusiasts. Its occurrence is mainly limited to a few localities worldwide, primarily in Mexico, and its abundance in nature is generally considered low.
In conclusion, tilasite is a rare borosilicate mineral that forms distinct tabular or prismatic crystals. It is found in schistose rocks and is commonly associated with other minerals. Despite its limited use, tilasite attracts attention for its aesthetic value and unique crystal structure.
