It is clear that there are multiple geologies here, ranging from the rich red to the quiet brown matrix. I am unsure how many different locations there are in this wintersports town, but at least some of these were only accessable for a short time during a building project in the city center. These are, it seems, distinct from Berghotel, which is one Oberhof location with a name of its own.
Oberhof Thunderegg with Twin Flames
Oberhof Thunderegg with Tri-lobed Core
Oberhof Thunderegg with Quartz Cave
Large Double Oberhof Thunderegg with Big Quartz Crystals