Chalcopyrite on Calcite

Beautiful single crystal of calcite with lines of chalcopyrite.  Sometimes called "Benz Calcite", because of the Mercedes benz logo-like shape that is created with the chalcopyrite coats lines where the three faces of calcite meet each other.  From Daye, China.  We recommend mounting this piece on a small acrylic base with sticky tac, as pictured.  The base is 1” x 1”.
 
Chalcopyrite is a captivating mineral sought after by collectors for its dazzling metallic luster and distinctive brassy gold coloration.  It forms in a variety of crystal habits, from granular masses to distinct tetrahedral or dodecahedral crystals, often exhibiting iridescent hues of purple, blue, and green, caused by surface oxidation.  This mineral is a significant source of copper ore and is commonly found in hydrothermal veins alongside other sulfide minerals such as pyrite and sphalerite.  In fact, we often refer to it as pyrite with a copper molecule added.  They are commonly mistaken for each other and can be difficult to distinguish when they are found in geologic occurrences together.
 
Calcite is a popular collectible mineral cherished for its diverse crystal habits, vibrant colors, and widespread occurrence.  Calcite is a common mineral found in sedimentary, metamorphic, and igneous rocks worldwide.  It crystallizes in the trigonal crystal system, forming rhombohedral or scalenohedral crystals with three cleavage planes that are often visible.
 
Calcite is a major component of limestone, marble, and chalk, as well as many other sedimentary rocks. It also forms in hydrothermal veins, as a precipitate from groundwater, and as a component of some igneous rocks.  Calcite has numerous industrial applications, including as a building material (limestone and marble), in the production of lime and cement, as a soil conditioner, in the manufacture of glass and ceramics, and as a source of calcium carbonate in dietary supplements.
 
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