Teletínský lom, Natural monument quarry in Teletin, Czech Republic

Teletínský lom is an abandoned quarry site near Teletín with steep stone walls exposing bands of granite and mixed rock types. The excavated walls display the geological layers and mineral formations characteristic of this region.

The quarry began active extraction around 1934 and supplied quality granite blocks for hydraulic structures and bridges in the region. Stone blocks were transported by cable car to the Stechovice dam construction site.

The quarry lies at the contact of the Central Bohemian Pluton and the Jílove Belt, and this magmatic breccia zone is the reason for its protection. Minerals such as pyrite, chalcopyrite, pyrrhotite, dolomite, siderite, calcite, apatite and fluorite crystallised on fissures in the rock. Aplite and pegmatite veins up to 20 cm thick cut through all the rock types.

The quarry is a protected natural monument and is not to be used for recreation; the management plan explicitly rules out recreational use and new construction. It lies 500 m east of Teletín, which is served by suburban transport, and the Svatojánské proudy educational trail runs along the Vltava bank. Nearby are the Máj and Smetana viewpoints and the small Teletín waterfalls.

At the boundary between two rock units lies a zone of magmatic breccia where biotite granite meets amphibolite-biotite granodiorite, creating a rare geological contact visible in the quarry walls. This exposed junction is what draws geologists and rock enthusiasts to study the site.