Kernite

Description

Kernite, chemically identified as a hydrated sodium borate hydroxide with the formula Na2B4O6(OH)2·3H2O, is also referred to as rasorite. This mineral possesses a monoclinic crystal structure and typically manifests as acicular or prismatic crystals, though it may also be found in granular aggregates. Physically, the material is characterized by a brittle fracture, perfect cleavage, a relatively low specific gravity of 1.91, and a Mohs hardness ranging from 2.5 to 3. In its pure state, it appears white or colorless. Within the context of ceramics, such borate minerals serve as critical fluxing agents, significantly lowering the melting point of glaze compositions and promoting the development of durable, vitreous surfaces. The solubility and chemical reactivity of this sodium borate source necessitate careful consideration during batch formulation to ensure consistent ceramic processing and thermal stability.