Among similar localities in the vicinity, the zeolite locality of Pusty vrch (Schie-chenberg) near Folknafe is characterized by the presence of thomsonite, chabazite, phillipsite and gismondine occurring in amygdales of a lava flow of "leucite"
tephrite composition (Tucek 1962).
Phenocryst-poor latite and trachyte are interpreted as the result of mineral separation, and phenocryst-rich
tephrite porphyry and olivine diabase porphyry are the result of phenocryst accumulations in the magma chamber.
In
tephrite and trachybasalt the phenocryst of plagioclase, augite, olivine, pargasite and phlogopite are embedded in the groundmass of plagioclase, Ti-augite, pargasite, phlogopite, apatite, opaque minerals (ilmenite) and devitrified glass (Sawada et al., 1992).
The rocks of the chilled margins and the central facies are classified as
tephrites, basalts, basaltic andesites and shoshonites whereas the pegmatoid facies includes the most evolved rocks: andesites and dacites (Fig.
Some stones remind him of "the lobe of the ear"; others, "the trunk of a tree." The shape of "Ammonis cornu imitates a horn"; asbestos and silver, "hair"; the motley crystals of igneous
tephrites "a new moon." In her poem "Poetry" Marianne Moore praises writers who depict "'imaginary gardens with real toads in them.'" But no twentieth-century poet is a finer "literalist of the imagination" than Agricola, who likens the "play of colors" in rock to those "on the neck feathers of certain African fowl when ruffled in anger and on the feathers of the peacock or pigeon when spread in the sun."
The volcanics are mainly basanites and
tephrites, mildly to strongly alkaline, and akin to the intra-plate volcanic rock series.
Basaltoid rocks are represented here by predominant
tephrites and basanites, rare foidites, and singular basalts and trachybasalts (Bolewski and Parachoniak, 1982; Kozlowska-Koch, 1987; Wierzcholowski, 1993; Lorenc et al., 2004).