Mcalpineite is a noun that refers to a rare mineral, specifically a zeolite mineral, with the chemical formula (Ca, K2, Na2)Al2Si4O12·6H2O. It was named after David McAlpine, a Scottish mineralogist, in recognition of his contributions to the field.
Mcalpineite belongs to the mineral class of silicates and is a member of the natrolite group. It forms in volcanic rock cavities, typically in association with other zeolite minerals such as natrolite, analcime, and thomsonite. This mineral usually occurs as acicular or fibrous crystals, often forming tuft-like or radiating aggregates.
In terms of its physical properties, mcalpineite is typically colorless to white and exhibits a vitreous to pearly luster. Its hardness ranges from 3 to 3.5 on the Mohs scale, indicating a relatively low level of hardness. It also has a white streak and a brittle tenacity.
As a zeolite mineral, mcalpineite possesses a unique framework structure with interconnected cavities and channels. These channels allow for the absorption and release of water molecules, giving zeolites their characteristic property of dehydration and rehydration. Consequently, these minerals are valued for their catalytic, adsorptive, and ion exchange properties in various industrial applications.
In summary, mcalpineite is a relatively rare zeolite mineral found in cavities of volcanic rocks. Its composition, crystal structure, and associated properties make it an important and sought-after mineral in the field of mineralogy and industrial applications.
