Kartosite

Kartosite is a rare mineral categorized within the phosphate minerals, characterized by a copper-rich composition. It has been described from copper-bearing hydrothermal environments and is typically considered a secondary mineral formed in oxidized zones of copper deposits.

The exact chemical formula and crystal structure of kartosite are not widely published, and its precise classification within phosphate minerals varies among sources. It is generally regarded as containing copper and phosphate groups, with possible substitutions by other metals in natural samples.

In hand specimen, kartosite is reported to appear as small crystals or masses with a green to blue-green color. The luster is typically described as vitreous, and transparency can range from translucent to opaque in many samples. Crystals, when present, are often described as prismatic or tabular, though specimens are usually limited in size.

Occurrence and associations: kartosite has been reported from oxidized zones of copper-bearing hydrothermal systems and is commonly found alongside other copper minerals and phosphates. Its occurrence tends to be limited and sporadic, contributing to its rarity in mineral collections.

Name and provenance: the name kartosite is derived from a locality or individual associated with its discovery in the primary literature. Due to its rarity, kartosite is mainly of interest to mineralogists and collectors, with most information drawn from a small number of published reports and mineral databases. See also copper phosphate minerals for related species.