抄録
Horobetsuite occurs associated with free sulphur and iron sulphide minerals, in the sulphur deposit of Horobetsu Mine. The chemical formula of horobetsuite has been determined as (Bi, Sb)2S3. The molecular ratio of Bi2S3 to Sb2S3 varies between 9:11 and 13:7. The mineral is intermediate between bismuthinite and stibnite in lattice constant, specific gravity, optical behaviour and etching reaction. The data obtained reveal the mineral to be a new species belonging to the bismuthinite-stibnite series. A new mineral name, horobetsuite, is proposed for the mineral of the series which should have the molecular ratio of Bi2S3 to Sb2S3 between 7:3 and 3:7.
