Cattiite
Cattiite is a rare magnesium borate mineral with the chemical formula Mg3(BO3)2·9H2O. It is a hydrated magnesium borate and belongs to the pinakiolite group.
Occurrence and Formation:
Cattiite typically forms as a secondary mineral in serpentinites and other magnesium-rich rocks that have been altered by hydrothermal activity. It is often found in association with other borate minerals such as ludwigite, szaibelyite, and kotoite, as well as serpentine minerals. The mineral's formation is dependent on the presence of boron-rich fluids and specific temperature and pressure conditions.
Physical Properties:
Cattiite typically occurs as colorless to white, transparent to translucent, prismatic or acicular crystals. It may also be found in massive or fibrous aggregates. It has a vitreous luster, a white streak, and a hardness of 2.5 to 3 on the Mohs scale. Its cleavage is perfect on {010} and its fracture is uneven. The specific gravity of cattiite ranges from 1.98 to 2.02.
Identification:
Cattiite can be identified by its characteristic crystal habit, low hardness, and association with other borate minerals. X-ray diffraction analysis is often used to confirm its identity.
Uses:
Due to its rarity, cattiite has no significant industrial uses. It is primarily of interest to mineral collectors and researchers studying the geochemistry of boron and magnesium-rich environments.