Adam Pieczka

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Although the distinction between magnesiodumortieite and dumortierite, i.e. Mg vs. Al dominance at the partially vacant octahedral Al1 site, had met current criteria of the IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) for distinguishing mineral species, the distinction between holtite and dumortierite had not, since Al and Si are(More)
Sodalite, Na8Al6Si6Cl2, from a pegmatitic variety of mariupolite in the Oktiabrski Massif (SE Ukraine) was studied using electron microprobe, electron microscopy, spectroscopic cathodoluminescence and Raman techniques to determine its growth history during the evolution of the host rock. Three generations of the mineral were distinguished: (1) the oldest(More)
Ab s t r a c t . An amphibolite-hosted quartzo-feldspar-mica pegmatite with schorl, green elbaite, spessartine, andalusite, spinel, hyalophane, zircon, columbite and beryl was found near Gilów in the E part of the Góry Sowie gneissic block (Lower Silesia, Poland). The black tourmaline crystals are chracterized by the change of their composition from Mgand(More)
Secondary cancrinite, (Na5.88K<0.01)∑5.88(Ca0.62 Fe0.01Mn0.01Zn<0.01 Mg<0.01)∑0.64[Si6.44Al 5.56O24](CO3)0.67(OH)0.26(F<0.01,Cl<0.01)·2.04H2O), was found as accessory component of mariupolite (albite-aegirine nepheline syenite) from the Oktiabrski massif in the Donbass (SE Ukraine). It probably crystallized from a subsolidus reaction involving nepheline(More)
Muscovite and two dark mica varieties (the coarse-crystalline, pegmatitic, and fine-crystalline with signs of early weathering) representing members of the biotite series, originating from mariupolite of the Oktiabrski massif, (Ukraine), were investigated along with their solid inclusions using electron microprobe and Raman micro-spectroscopy to discuss(More)
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