Polybasite is a sulfosalt mineral of silver, copper, antimony and arsenic.Its chemical formula is [(Ag,Cu) 6 (Sb,As) 2 S 7][Ag 9 CuS 4]. It forms black monoclinic crystals (thin, tabular, with six corners) which can show dark red internal reflections. It has a Mohs hardness of 2.5 to 3. It is found worldwide and is an ore of silver. The name comes from the number of base metals in the mineral.
Polybasite Crystallography: Axial Ratios: a:b:c =1.732:1:1.5842 : Cell Dimensions: a = 26.12, b = 15.08, c = 23.89, Z = 16; beta = 90° V = 9,410.02 Den(Calc)= 6.08
Polybasite definition is - an iron-black metallic-looking ore (Ag,Cu)16Sb2S11 of silver consisting essentially of silver, copper, sulfur, and antimony.
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Define polybasite. polybasite synonyms, polybasite pronunciation, polybasite translation, English dictionary definition of polybasite. n. A black mineral with a metallic luster, essentially 16Sb2S11, that is an ore of silver. n a grey to black mineral consisting of a sulphide of silver,...
Polybasite is an uncommon mineral containing silver and copper in its structure. It is almost always found in known silver deposits, often in association with Stephanite.Polybasite forms a series with Pearceite, with Polybasite being the antimony-rich member, and Pearceite being the arsenic-rich member.It is often not possible to visually distinguish these two minerals from each other.
The polybasite spec imens are similarly iridescent, but are rosettes of very thin, symmetrically offset hexagonal plates; most of these too are thumbnails, but there are two 5-cm miniatures in which the polybasite rosettes reach 3 cm across.
Polybasite definition: a grey to black mineral consisting of a sulphide of silver , antimony , and copper in the... | Meaning, pronunciation, translations and examples
A mineral of the hexagonal crystal system that is a sulphide and antimonide of silver and copper, (Ag,Cu)₁₆ Sb₂ S₁₁, and occurs as thin, tabular, black, metallic crystals.
The polybasite crystals, of which this is one of the larger and more robust examples that I have seen for sale from the locality, have been previously very scarce on the market in any size above thumbnail. Most are thin plates, whereas this is a robust, 3-dimensional cluster.