GILALITE Meaning and
Definition
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Gilalite is a mineral that belongs to the apophyllite group, specifically to the phyllosilicates subclass. It has a chemical composition of Cu5Si6O17 · 7H2O and typically forms as tabular or prismatic crystal aggregates. The mineral derives its name from the Gila River, near its type locality in Arizona, United States.
Gilalite is characterized by its unique blue-green to bluish-grey color, which can be attributed to its copper content. It exhibits a vitreous to pearly luster on its cleavage faces and displays a monoclinic crystal system. Cleavage of gilalite occurs in one direction, resulting in thin, flexible sheets that are easily separable. Its hardness falls within the range of 3 to 4 on the Mohs scale, making it relatively soft.
This mineral is often found in the oxidized zones of copper deposits, occurring as secondary mineralization. It commonly forms in association with other copper minerals such as malachite and chrysocolla. Additionally, gilalite exhibits fluorescence under ultraviolet light, emitting an intense green glow.
Though gilalite is a relatively rare mineral, it has gained popularity among mineral collectors due to its vibrant color and lustrous appearance. Its pleasing aesthetics make it a desirable addition to mineral collections and it may also be utilized for ornamental purposes.
Etymology of GILALITE
The word "gilalite" is derived from the name of the locality where the mineral was first discovered, Gilal, located in the Kerman Province of Iran. Gilalite is a rare mineral and was first identified and described in 1973 by Iranian mineralogist, Parviz Darban. The name "gilalite" was subsequently given to the mineral in honor of the locality of its discovery.
