Betaeucryptite

Betaeucryptite is a rare mineral that belongs to the sulfosalts group of minerals. It has a chemical composition of Na3AlSi6O16·8H2O and is characterized by its complex crystal structure. This mineral is optically biaxial, with a refractive index that ranges from 1.505 to 1.509, and it exhibits a perfect cleavage along the C-face.

Betaeucryptite is typically found in regions that have been subjected to high-pressure and high-temperature conditions, such as pegmatites and hydrothermal veins. It often co-occurs with other minerals, including turquoise, quartz, and lepidolite. The mineral's crystal structure is complex, with a platy habit and a distinctive tabular cleavage.

In terms of its physical properties, betaeucryptite is relatively soft, with a Mohs hardness of 2.5 to 3. It has a pale blue color and a vitreous luster. The mineral is relatively dense, with a density range of 2.41 to 2.44 g/cm³.

Betaeucryptite has been studied from a geological perspective, with research focusing on its formation conditions and its geomorphological characteristics. The mineral's composition and structure have also been the subject of scientific inquiry, particularly in terms of its thermal and mechanical properties.

Overall, betaeucryptite is a rare mineral that is characterized by its complex crystal structure and its specific chemical composition. Its occurrence in pegmatites and hydrothermal veins highlights its formation in high-pressure and high-temperature environments.