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We present here a report on the results of X-ray analyses and chemical analyses of the specular iron (hematite) produced in a steam vent of Mt. Maekake, the inner somma of Volcano Asama. The X-ray analyses showed us the presence of minor quantities of magnetite besides hematite, and the measurement after accurate correction by mixing silicon as a standard proved that the hematite is of the quite common variety with lattice constants a0: 5.034Å and c0: 13.73Å.
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We have carried out chemical analyses on springs and underground waters collected from 31 localities on and around the Volcano Asama. Their characteristic chemical features are as follows: (A) generally rich in ΣCO2; (B) mostly poor in Cl-; (C) generally poor in SO4-- with an exception of those from Zigokudani; (D) comparatively rich in H2SiO3; (E) a little rich in Ca++: (F) show a remarkable difference between RoH and pH; and (G) give the ratios K(K+Na)=5～15% and Ca(Ca+Mg)=60～70%. They are classified according to their chemical contents into three groups: type (1) containing SO4--, ΣCO2, Al+++ and Fe++; type (2) ΣCO2 and Fe++ and type (3) chiefly ΣCO2.
