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Hachijo island

Sueyoshi, Hachijo city, Tokyo, Japan

Source for salt


Halite at a seashore. The cubic white crystals are halite. The black basement is the Late Pleistocene (0.14 Ma) basalt lava erupted from the Nishi-Hakuunzan caldera of Higashiyama Volcano, Hachijo island. The halite crystals were formed by evaporation of seawater near the seashore. As halite is soluble in water, these crystals cannot be observed in rainy season.

The age of basalt was determined by K-Ar radiometric dating. Formed in less than a month,

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