Amethyst

Mount Ametsuka / Santai Mine

Obara, Shiroishi city, Miyagi pref., Japan

This locality is closed to collecting.

IMA approved name

Quartz var. amethyst

Source for silicon

Length of the upper most crystal: 20 mm. Crystals of amethyst. The prismatic crystal at the top has striations vertical to the prism elongation.

Recovered from an open space of a galena- and argentite-bearing amethyst vein in rhyolite of a low-temperature hydrothermal deposit.

Amethyst from this location was described in 1893.