Blefariit

Blefariit is a rare, translucent mineral that belongs to the carbonate mineral group. It is primarily composed of calcium, magnesium, and carbonate ions, with the chemical formula Ca2Mg(CO3)2. Blefariit was first discovered in the late 19th century in the Blefari mine in Greece, from which it derives its name. The mineral is typically found in metamorphic rocks, particularly in association with other carbonate minerals such as calcite and dolomite.

Blefariit crystals are often prismatic or tabular, and they can exhibit a variety of colors, including white, gray, and yellowish hues. The mineral has a Mohs hardness of approximately 3.5 to 4, making it relatively soft. Its specific gravity ranges from 2.9 to 3.1, indicating that it is lighter than many other minerals.

Blefariit is not commonly used in industrial applications due to its rarity and soft nature. However, it is occasionally collected by mineral enthusiasts for its aesthetic appeal and the scientific interest it represents. The mineral's rarity and the specific conditions under which it forms make it a subject of interest for geologists and mineralogists studying the geological processes that lead to its formation.