Linarite

Linarit, outdated or by mining as a lead glaze, Kupferbleispat ( h), Kupferbleivitriol or copper Anglesit ( Cupreous Angel Site ), is a rarely occurring mineral from the mineral class of sulfates. It crystallizes in the monoclinic crystal system with the chemical composition PbCu [( OH) 2 | SO4 ] and developed mostly tabular to prismatic crystals, but also crusty coating in sky blue to azure blue color with a strong vitreous luster to adamantine.

Special Features

Linarit the azurite of color and crystal structure is very similar, can be distinguished by the " acid - test " from the latter. When Linarit differs in contrast to azurite, when treated with hydrochloric acid white lead chloride from .. Also soluble in dilute nitric acid is Linarit.

Etymology and history

Linarit 1822 was first described by Henry James Brooke, who named the mineral after its type locality Linares in Spain.

Classification

In the old ( 8th edition ) and new classification of minerals according to Strunz ( 9th edition ) of the Linarit belongs to the department of " water clear sulfates with foreign anions ." The new Strunz'sche Mineral classification divided here but now more specific on the size of the cations and the mineral is in accordance with the subsection " C. With medium -sized and large cations to find. "

The commonly used in English-speaking classification of minerals according to Dana sorted the Linarit in the department of " Anhydrous sulfates with hydroxyl or halogen, and the general formula ( AB) 2XO4Zq ".

Education and Locations

Linarit is a typical secondary mineral that forms in the oxidation zone of copper and lead sulphides. Accompanying minerals include anglesite, Brochantite, Caledonit, cerussite, hemimorphite Leadhillit and malachite.

So far Linarit was detected at 693 localities, including, inter alia in Catamarca and Neuquén in Argentina; Tasmania and other regions of Australia; several regions of Chile; Baden- Württemberg ( Black Forest), Bavaria ( Fichtelgebirge), Hesse (Taunus ), Lower Saxony ( resin ), North Rhine -Westphalia (Sauerland ), Rhineland -Palatinate (Eifel, Hunsrück ), Saxony -Anhalt, Saxony (Erzgebirge) and Thuringia ( resin ) in Germany; many regions of France, in Greece on Laurion and recently also on Santorini; at Keswick ( Cumbria ) and Lead Hill (Scotland ) in the UK; several regions of Italy; Tsumeb in Namibia; Carinthia ( Lölling ), Salzburg ( Hohe Tauern ), Styria ( Fischbacher Alps) and Tyrol in Austria; Nertschinsk in Siberia; Bohemia and Moravia in the Czech Republic; Rezbanya in Hungary; and in many region of the United States.

Known for their Linaritfunde with 5 to 8 cm in size are mainly the " Mammoth Mine" and the " Grand Reef Mine" in Arizona (USA).

Crystal structure

Linarit crystallizes in the monoclinic crystal system, space group P21 / m ( Raumgruppen-Nr. 11) with the lattice parameters a = 9.70 Å, b = 5.65 Å, c = 4.69 Å and β = 102.6 ° and two formula units per unit cell.