Felbertalite, a rare mineral, is a member of the zeolite group of minerals. It was first discovered in the Felbertal, Austria, hence the name. This mineral typically occurs as small tabular or blocky crystals within basaltic rocks. Its chemical formula is commonly presented as (K,Na)8(Ca4,Na2)[Si136O278(OH)2](H2O)44 and therefore signifies its intricate and complex structure.
Felbertalite possesses remarkable physical properties, including a vitreous luster and a transparent to translucent appearance. It typically exhibits an array of colors, ranging from colorless to white, light yellow, pink, or gray. Its crystal system is triclinic, meaning it has three unequal axes, making it belong to the triclinic crystal class.
The mineral felbertalite is hydrothermally formed and is typically found in the voids of volcanic rocks filled with the solutions rich in alkali elements, calcium, and silica. It forms as a result of the alteration of other silicate minerals, with various zeolites being common associated minerals. Additionally, felbertalite is also known for its strong absorbent properties, making it a valuable material for various industrial applications.
Due to its rarity and aesthetic appeal, felbertalite has gained recognition among mineral collectors and enthusiasts worldwide. The economic value of the mineral remains relatively low, mainly due to its scarcity. Nevertheless, its distinct characteristics and significance within the scientific community make felbertalite a noteworthy addition to the zeolite family.
