BÃlinite
Bílinit is a rarely occurring mineral from the mineral class of " sulfates ( and Related ) ". It crystallizes in the monoclinic crystal system with the composition Fe2 Fe23 [ SO4 ] 4 · 22H2O, that is chemically a hydrous iron sulfate.
Bílinit is translucent and usually develops fibrous crystals in radialstrahligen aggregates of white to pale yellow color and silky luster.
Special Features
Bílinit is water soluble.
Etymology and history
Was first discovered Bílinit in a coalmine near Světec near Bílina in the Czech region of Bohemia and scientifically described in 1913 by Sebor, who named the mineral after its type locality Bílina.
Classification
In the now outdated but still in use 8th edition of the mineral classification by Strunz the Bílinit to the mineral class of " sulfates, selenates, tellurates, chromates, molybdates and tungstates " belonged and there to the Department of " water -containing sulfates without foreign anions ", where he with Apjohnit, Dietrichit, Halotrichit, Pickeringite, Redingtonit and Wupatkiit the " Halotrichitgruppe " with the system no. VI/C.12 formed.
The 9th edition used since 2001 and valid by the International Mineralogical Association (IMA ) of the Strunz'schen Mineral classification assigns the Bílinit also in the class of " sulfates ( selenates, tellurates, chromates, molybdates and tungstates ) " and then in the Department of " Sulfate ( selenates, etc. ) without additional anions, with H2O" one. This division, however, is further divided according to the relative size of the cations involved, so that the mineral is "With only medium-sized cations " to find according to its composition in the subdivision where it together with Apjohnit, Caichengyunit, Dietrichit, Halotrichit, Pickeringite, Redingtonit Wupatkiit the " Halotrichitgruppe " with the system number. 7.CB.85 forms.
The mostly commonly used in English-speaking classification of minerals according to Dana assigns the Bílinit in the class of " sulfates, chromates and molybdates " and then in the Department of " Water-containing acids and sulfates " one. Here he is with Apjohnit, Dietrichit, Halotrichit, Pickeringite, Redingtonit and Wupatkiit in the " Halotrichitgruppe (monoclinic with 22 H2O) " with the system no. 29.07.03 within the subdivision " water -containing acids and sulfates with A (B ) 2 ( XO4 ) 4 × x (H2O) " to find.
Education and Locations
Bílinit formed by weathering of various iron sulfides in lignite. As an accessory mineral occurs among other melanterite.
A rare mineral formation Bílinit previously could (as of 2012) are detected only at a few localities. In the Czech Republic, however, no further locality is known in addition to its type locality Světec at Bílina.
Other localities include the " Osamu Utsumi Mine" on the plateau of Poços de Caldas ( Minas Gerais ) in Brazil; Drivdalen, Ørnhammeren and Vinstradalen in the Norwegian municipality Oppdal; the Nikitovka deposit in the Donets Basin near Donetsk in Ukraine; Szorospatak in Hungarian Matra Mountains as well as the " Higgins Mine" in Bisbee (Arizona ), the Tintic Mountains in Utah County ( Utah) and Cedar Mountain Prospect in Snohomish County ( Washington) in the United States of America.
Crystal structure
Bílinit crystallizes in the monoclinic space group P21 / a ( Raumgruppen-Nr. 14) with the lattice parameters a = 21.25 Å; b = 24.33 Å; c = 6.21 Å and 100.3 ° and β = 4 formula units per unit cell.