Lisetite is a rare and unique mineral that belongs to the group of silicate minerals. This mineral is categorized under the epidote group and is composed primarily of aluminum, silicon, oxygen, and various other elements such as iron, calcium, and hydrogen. The chemical formula of lisetite is typically written as (Ca,Fe,Al)(Al,Mg,Mn)(Si2O7)(SiO4)O(OH).
Lisetite is known for its distinctive physical properties including its vitreous to greasy luster and its green to dark green coloration, which can sometimes appear almost black. It possesses a moderate to high hardness on the Mohs scale, ranging from 6.5 to 7, making it relatively resistant to scratching. It also demonstrates a brittle tenacity and uneven fracture.
This mineral typically occurs in metamorphic rocks, particularly those that have undergone medium to high-grade regional metamorphism. It is commonly found in association with other minerals such as garnet, diopside, vesuvianite, and biotite. Lisetite can be translucent to opaque in nature and commonly occurs in prismatic or tabular crystal habit.
Due to its limited occurrence and relative rarity, lisetite is predominantly prized by mineral collectors and enthusiasts. Its unique green coloration and intriguing crystal formations make it a desirable addition to mineral collections and its scarcity contributes to its overall value in the market.
