Bulletin Mineralogie Petrologie

The new occurrence of pargasite and forsterite phenocrysts was discovered in basalts in the area of a former field near the Očová village, Zvolen Co., Banská Bytrica Region (central Slovakia). Pargasite forms vitreous dark brown to black crystals up to 6 cm in size. Its chemical composition shows dominant Mg²⁺ (3.07 - 3.16 apfu) followed by Fe²⁺ (0.84 - 1.00 apfu) and elevated Ti (0.22 - 0.27 apfu) at the amphibole crystallochemical C site with the average chemical composition (n = 15) ^A(Na_0.58K_0.35)^B(Ca_1.83Na_0.11Fe²⁺_0.05Mn_0.01)^C(Mg_3.12Fe²⁺_0.92Al_0.62Ti_0.25 Fe³⁺_0.10V_0.01)^T(Si_5.97Al_2.03)^V O₂₂^W[(OH)_1.99F_0.01]₂. Forsterite crystals have vitreous lustre with greenish to dark yellow colour, reaching up to 16 mm in size. Its chemical composition corresponds to the average endmember formula (n = 15) as Fo_88.9Fa_12.6Tep_0.2. This find represents an occurrence of unusually large crystals of pargasite associated with forsterite in igneous rocks of the Neogene Poľana stratovolcano.

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