Edingtonite is a rare mineral that belongs to the group of zeolites. It is named after the location of its discovery, Edington, in Wiltshire, England. This mineral typically occurs as small, prismatic crystals or in fine-grained masses, often forming intergrowths with other zeolites.
The chemical formula of edingtonite is approximately (Ba,Sr)6(Al6Si9O32)·11H2O, indicating its composition which involves the elements barium (Ba), strontium (Sr), aluminum (Al), silicon (Si), oxygen (O), and water (H2O). It possesses a monoclinic crystal system, with its crystal structure consisting of layers of interconnected 8-membered rings of tetrahedra.
Edingtonite is commonly found in cavities and vesicles of volcanic rocks, usually of basaltic composition. It is formed through interactions between volcanic rocks and hydrothermal solutions, which gradually deposit the mineral in open spaces within the rock. Edingtonite crystals are often colorless or pale yellow and possess a vitreous to silky luster.
In terms of its physical properties, edingtonite has a Mohs hardness of around 3 to 4, making it relatively soft. Its specific gravity ranges from 2.95 to 2.99. When exposed to ultraviolet light, this mineral commonly exhibits fluorescence, emitting a yellowish glow.
While edingtonite has limited practical uses, it is highly sought after by mineral collectors due to its rarity and attractive crystal formations. Its intricate crystal structure and association with other zeolites make it a fascinating specimen for study and appreciation within the field of mineralogy.
