Ardennite and sursassite have been found in the outcrop of the Hakuryu mine, Tokushima Prefecture, being a metamorphic manganese deposit of the Muramatsu type, and also as boulders in the Kamogawa river, Ehime Prefecture. They are embedded in piemontite bearing quartz schists in the Sanbagawa belt. The ardennite and the sursassite show two different occurrences. One is observed in layers of fine crystal aggregates, with quartz, spessartine, chlorite, piemontite and braunite, and the other is in veinlets cutting a quartz-braunite-piemontite ore. Both minerals associate with each other and sometimes show parallel intergrowths. The ardennite is yellowish brown or golden yellow and the sursassite is reddish brown in color. They are subhedral, or euhedral crystals up to 5 mm in length and are chemically heterogeneous. The ardennites are characterized either by high V or As contents, and also by high SiO₂ content. The Hakuryu sursassite is rich in manganese in comparison with that of Kamogawa, and shows extensive substitution of Mn and Fe for Al, and of Ca for Mn.

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This review will be concerned with calorimetry of sulfides and sulfide minerals in order to survey a situation to date of thermodynamic experiments for sulfides. Methods of calorimetry which appeared in reference articles quoted in the present review were briefly explained. About 55 compounds including 33 elements with sulfur were cited in their characteristic points of calorimetry. Phase transition phenomena, if they exist for a calorimetry of a compound, were described in detail. There are few calorimetric measurements using natural sulfide minerals as sample materials. For a better understanding of these valuable minerals, it is strongly desired to produce thermodynamic data for sulfides by various methods of calorimetry capable of executing inspections of the internal consistency among the data.

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