Teme pričujočega besedila so izvor, delovanje, dosežki ter konec rodbine gospodov Rogaških – stranske veje rodbine Konjiških. Namen članka je najprej poiskati podatke o vseh pomembnejših članih ...rodbine, zatem pa opisati njihovo politično participacijo. V času, ko je rodbina obstajala je bilo politično stanje na področju današnje slovenske Štajerske precej nestabilno. Rogaški so morali politične poteze zato vleči kar se da previdno. Smemo jih prištevati med osem v 13. stoletju najmočnejših rodbin današnje slovenske Štajerske. Do odgovorov na naša vprašanja pridemo z analizo ohranjenih pisnih virov, t. i. Deželne knjige Avstrije in Štajerske ter raznovrstnih listin.
Dacitic glassy lava flow at Trlično is surrounded by a dacite – siltstone peperite and peperitic breccia that underwent alteration, recognised in two, only a few metres thick zones. In the ...higher-temperature alteration zone, albite extensively replaces volcanic glass and primary plagioclases. The siltstone components are altered to microcrystalline quartz, iron oxides and interlayered illite/smectite clay minerals. This zone developed upon thermalmetamorphosis related to the transfer of heat from the cooling lava. In the lower temperature alteration zone, analcime occurs as the replacement of volcanic glass and pore- and fissure-filling, while the primary plagioclases and poorly lithified siltstone remained fairly unchanged. This zone developed under hydrothermal conditions related to the heating, circulation and reactions of pore waters in the sediment surrounding the lava flow.
Glassy lava from Trlično is dacitic in composition and developed by incomplete mixing of two magmas of similar composition but different degree of groundmass crystallinity.By laminar lava flow banded ...texture developed consisting of bands with different magma types. Abundance of major and trace elements is within the variation range for dacites. Comparison with the Smrekovec andesites in Northern Slovenia indicates that the rocks do not originate from the same volcanic complex, displaced by tectonic activity.
Trg Rogatec z gradom Strmol (levo). V osrednjem delu prepoznamo grad Rogatec v začetni fazi propadanja. Manjka ostrešje, zidovje je še ohranjeno.(faksimile Kaiserjeve suite 1824 -1833)
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