Kagami-iwa rock at Mount Mitake, Slickenside formation at Mount Mitake, Japan
Kagami-iwa is a rock formation on Mount Mitake's slope with a highly polished surface created by ancient geological forces. The slickenside displays smooth, reflective patterns that developed from tectonic friction over millions of years.
The rock formation developed roughly 100 million years ago as part of the Hachioji fault line's creation. In 1956, the site received designation as a Special Natural Monument due to its geological significance.
The rock sits near Kanasana Shrine, where mountain worship takes place without a conventional building structure. Visitors can sense how this location blends spiritual practice directly with the natural environment.
The rock can be reached through maintained hiking trails connected to the Mitake cable car station, which runs services throughout the day. Wear sturdy shoes since the ground is steep and the stone surface becomes slippery when wet or during humid conditions.
This is one of Japan's few formally designated slickenside formations and shows clear marks of ancient tectonic shifting. The polished surface resulted from friction during Earth movements millions of years ago and remains visible today.
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