Open AccessNÁLEZ HLINÍKEM BOHATÝCH SPINELIDŮ A KORUNDU VE STRUSKÁCH PO TAVBĚ STŘÍBRNÝCH RUD ZE STŘÍBRNÝCH HOR NA HAVLÍČKOBRODSKU
Author(s) -
Kateřina Janíčková,
Zdeněk Dolníček
Publication year - 2016
Publication title -
geologické výzkumy na moravě a ve slezsku v roce .../geologické výzkumy na moravě a ve slezsku v roce ...
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.128
H-Index - 1
eISSN - 2336-4378
pISSN - 1212-6209
DOI - 10.5817/gvms2015-1-2-52
Subject(s) - sillimanite , corundum , mineralogy , mullite , spinel , quartz , metallurgy , electron microprobe , microprobe , geology , materials science , biotite , ceramic
This work deals with the unique association formed by spinelides and corundum in historical slag after smelting of silver ore from the site Stříbrné Hory in the Havlíčkův Brod Ore District. To study these phases, polarizing microscope and electron microprobe (WDX and EDX) were used. The slag consists primarily of glass and residual quartz, which also contained sillimanite needles. During smelting the quartz and sillimanite have been partially melted and aluminium-rich spinelides crystallized in the surrounding glass. Euhedral crystals of spinelides range 5 to 25 μm in size and are composed predominantly of hercynite (55–58 mol. %), to a lesser extent gahnite (21–24 mol. %), spinel (18–24 mol. %) and galaxite (4–5 mol. %). Corundum probably originated during the smelting from secondary mullite at temperatures around 1 300 °C. Corundum together with glass form a paramorphosis aft er sillimanite aggregate.