Pronunciation: [zˈa͡ʊbɪkˌa͡ɪt] (IPA) 
Zoubekite is a rare mineral that is typically opaque and black in color. Its chemical formula is CuPbBiS3, which means it contains copper, lead, bismuth, and sulfur. The spelling of zoubekite can be explained using IPA phonetic transcription as /zuːbəkʌɪt/. The "z" is pronounced as "zoo," the "ou" as in "soup," the "b" as in "bed," the "k" as in "kite," and the "e" as in "bet." The last syllable "ite" simply rhymes with "light."
Zoubekite is a rare mineral belonging to the family of sulfosalt minerals. It was first discovered in 1940 in the Stölzle quarry in Carinthia, Austria, and was named in honor of Professor Adolf Zoubek, a notable Czech mineralogist. Zoubekite typically occurs as elongated prismatic crystals or thin fibrous aggregates, often exhibiting a metallic luster.
Chemically, zoubekite is classified as a complex copper-iron-arsenic sulfosalt mineral, with the chemical formula (Pb,Cu,Fe)15(As,Sb,S)4S27. Sulfosalt minerals are characterized by the presence of both metallic and non-metallic elements bonded together in a unique crystal structure.
Zoubekite commonly occurs in hydrothermal veins associated with other sulfide minerals such as pyrite, sphalerite, or chalcopyrite. It is typically found in dark-colored rocks, often in close proximity to ore deposits or within hydrothermal systems.
In terms of physical properties, zoubekite is relatively soft with a Mohs hardness of 2.5 to 3. Its color can vary from grayish-black to dark lead-gray, and it exhibits a black streak when scratched on a porcelain plate. Zoubekite has poor cleavage, meaning it tends to fracture rather than break along distinct planes.
Due to its rarity and limited occurrence, zoubekite has minimal commercial value. However, it is highly sought after and valued by mineral collectors and enthusiasts due to its distinctive crystal habits and unique chemical composition.
