Putnisite is a relatively newly discovered mineral that belongs to the family of complex hydrated calcium and aluminium phosphates. It is characterized by a unique crystal structure and has a distinct chemical composition, making it a rare and valuable addition to the field of mineralogy.
The term "putnisite" was derived from the name Anthony John Putnis, an Australian mineralogist, in recognition of his significant contributions to the study of minerals and mineral formations.
In terms of physical properties, putnisite forms as small aggregates or clusters of tabular crystals, typically exhibiting a vitreous to resinous luster. Its color can vary from pale pink to salmon, with translucent to transparent transparency. The mineral is often found associated with other calcium and aluminium-based minerals, as well as with phosphates and oxides.
Chemically, putnisite is composed of calcium, aluminium, oxygen, and hydrogen, with the addition of phosphorus as a significant component. Its crystal structure is intricate and consists of interconnected channels that allow the incorporation of water molecules. This unique structure conveys putnisite's fascinating properties, such as its propensity to exhibit thermochromism, which causes a change in color with varying temperatures.
Due to its rarity and aesthetic appeal, putnisite has gained recognition among collectors and mineral enthusiasts. Its discovery has expanded our understanding of crystal chemistry and the fascinating world of minerals.
