Fehér Béla (szerk.): Az ásványok vonzásában, Tanulmányok a 60 éves Szakáll Sándor tiszteletére (Miskolc, 2014)
Ozdín Daniel - Szakáll Sándor: A Miskolc-lillafüredi axinit-(Fe) kémiai összetétele
Chemical composition of axinite-(Fe) from Miskolc-Lillafiired 213 4.1. Other minerals of axinite mineralization Albite, NaAlSi308, a mineral from the feldspar group, is abundant especially in metabasalt and is present in the form of white crystals on the rims of thin veinlets of calcite (Fig. 9). On veinlets albite is euhedral to subhedral. In metamorphic rocks, where albite occurs together with epidote, main mineral is anhedral, less frequently subhedral. It is genetically the oldest mineral on the veins. On calcite veinlets albite is hydrothermal and it is calcium-free (according to EDS spectra), metamorphosed albite in metabasalt is characterised by low concentration of calcium (less than 1 wt. %). This difference is clearly visible on the BSE images, where the hydrothermal albite from veins is darker than the rock-forming altered albite (Fig. 9). Fluorapatite, Ca5(P04)3F, is a relatively scarce mineral in the metabasalt. It usually forms individual anhedral and rounded grains up to 0.25 mm (Fig. 10) in association with albite, epidote, clinochlore and calcite. Less frequently, fluorapatite has weak chemical Fig. 9. Characteristic assemblage of Alpine type paragenesis from Miskolc-Lillafiired: calcite vein- lets (grey) with albite (dark grey) and minerals of the epidote group (light grey). BSE image. 9. ábra. A Miskolc-lillafiiredi alpi-típusú paragenesis jellegzetes társulása: kalciterek (szürke) albittal (sötétszürke) és az epidot-csoport ásványaival (világosszürke). Visszaszórt- elektronkép. Fig. 10. Fluorapatite crystals (Ap) with base minerals of metabasalt [epidote (Ep) and albite (Ab)] with genetically younger minerals [Fe-Ti oxides (very small white grains especially on the left part of the picture), clinochlore (Chi) and calcite (Cal)]. BSE image. 10. ábra. Fluorapatit-kristályok (Ap) a metabazalt alapásványaival [epidot (Ep) és albit (Ab)] genetikailag fiatalabb ásványokkal [Fe-Ti-oxidok (nagyon kicsi fehér szemcsék, főleg a kép bal oldalán), klinoklor (Chl) és kalcit (Cal)]. Visszaszórt-elektronkép.
