Parkerite is a mineral that belongs to the group of sulfides and is specifically classified as a lead sulfantimonide. Its chemical formula is Pb8(Sb,As)8S20, indicating its composition primarily consists of lead (Pb), antimony (Sb), arsenic (As), and sulfur (S). Parkerite typically forms in hydrothermal ore veins that are associated with base and precious metal deposits.
In terms of physical properties, parkerite is generally opaque and has a metallic luster. Its color ranges from steel-gray to black, and it often displays a dark gray streak. It crystallizes in the orthorhombic crystal system, forming elongated prismatic or needle-like crystals. The mineral's hardness falls between 2.5 and 3 on the Mohs scale, which means it is relatively soft and can be scratched by a copper penny.
The name "parkerite" was derived from its first discovery in 1897 by C.H. Parker, an English mining engineer, in Cornwall, United Kingdom. It occurs in several other countries such as Austria, Sweden, and the United States, where it has been found in states like Nevada and Colorado.
As a relatively rare mineral, parkerite does not have significant practical uses beyond its role as a collector's mineral and a subject of scientific study. It is valued for its unique crystal structure, as well as its association with other valuable minerals in certain ore deposits, providing insights into geological processes and mineralization.
