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In the vicinity of forest road up the hill to the old lůmky granitic pegmatites. Originated as venous accompaniment of local granite bodies, mostly in the cracks in the rocks surrounding the granite itself. They are rich feldspar and mica light – muscovite, there are also quartz crystals. Rare biotite are burrs in the form of flat formulaic crystals, columnar crystals of black tourmaline. Coarse-grained pegmatites often accompanied by fine-grained two-mica veins aplitů.

They are coarse-grained hypabyssal rock composed mostly of feldspar, quartz and bright mica (muscovite), sometimes containing other minerals. Pegmatite veins and lenses break through here schists and mica schist gneiss. Since the mid-19th century from local quarried feldspar pegmatite in ceramic and glass manufacturing. Mining practiced in small farmers removing and shafts, earned then sending material by rail to meclovských and poběžovických mills. In the 20th century, attention turned to the tabular mica – muscovite, which is a normal part of local pegmatites. Mica was mined in hybrids, and Hostíčkova Křepkovice. The remnants of the mining activities were preserved on the southern slopes of the hill Trdlina Hostíčkova. The largest of these is the Pit quarry, which was mined up to 20 m thick and 130 m long steep pegmatite lens stored in svorových gneisses. The bearing is almost completely depleted, sites are still preserved in the walls of the quarry outskirts of pegmatite. Below the bottom of the fracture leads 150 m long tunnel, which results in a slope of 35 vertical meters below. Other body was mined less than 200 m further to the southwest. Remnant of the surface dobývka measuring roughly 30×10 m At the bottom of the southwest. he's the edge of the mouth of the shaft, which is probably linked to the tunnel that leads 125 m southeast. In line adit about 40 m from its mouth zabořeného is another shaft.

GPS position

N 49° 52.816', E 12° 49.728'