Slmiy waste lime was utilized as precipitating agent for sea water magnesia having the CaO: MgO mol ratio of about 0.2. The precipitate was burned at 1500°C for 3 hrs. On the obtained samples of refractories, chemical analysis, tests on physical properties, slaking test, corrosion test against basic steel furnace slag as well as against fused phosphate fertilizer and Portland cement clinker were made. The results show possible use of these low cost refractories to the steel, fertilizer and cement industries.

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The results are summarised as follows:
1. The chemical formula of Calcium sulphite was found to be CaSO₂⋅1/2 H₂O.
2. The heat of oxidation of crystalline and amorphous CaSO₃⋅1/2 H₂O are 60.51 kcal/mol and 62.95 kcal/mol respectively.
3. Crystalline calcium magnesium sulphite was discovered and its chemical formula was determined to be CaMg(SO₃)₂⋅7H₂O.
4. The dehydration temperature of crystalline and amorphous CaSO₃⋅1/2 H₂O are 400°C and 375°C respectively. The compound CaMg(SO₃)₂⋅7H₂O dehydrates stepwise at 110°C and 200°C.
5. The calcium sulphite when suspended in water is easely oxidized with air bubbles to good gypsum crystals.

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Isotopic abundance ratio of oxygen in refractory siliceous stone in Japan was investigated. Several methods for separation of oxygen in silicates were criticized, and two of them were investigated experimentally. The first reaction was
SiO₂+2Mg=Si+2MgO Cl₂/300-310°C→SiCl₄↑+2MgO HCl/400-500°C→2MgCl₂+2H₂O-↓O₂
electrolytic
decomposition
The yield of this reaction was about 40%. The second reaction was
SiO₂+2KHF₂ 230-300°C/→K₂SiF₆+2KF+2H₂O
The yield of this reaction was about 95%. The second reaction was used for our research.
Two thirds of the distilled water was electrloytically decomposed, and the obtained oxygen was recombined with the hydrogen stored in a bomb. The same proportion of the standard water (tap water of Osaka city) was also electrolytically deccmposed and recombined with the hydrogen of the samebomb. Density difference between the both water was determined with a froat. Deviation of the abundance ratio (δ) of oxygen was calculated, and the results were compared with that of P. Baertschi and Sol R. Silverman.
Deviation of silica stone and diatomite was +1.2-+13.5, and that of igneous minerals was -3.5--5.7 (gneissic granite, South Dakota=±0.0). According to P. Baertschi, deviation of sedimentary rocks was +2-+22, and that of igneous rocks was 0--4.5. Therefore, Mikawa quartz schist, Tamba recrystallized chert, Kuroda chert, Tamba vein quartz, and Wakasa vein quartz is of sedimentary origin. It is noteworthy that the vein quartz in the Tamba siliceous stone (compound rock) has the value as high as the recrystallized chert in the same rock. Accordingly, this vein quartz it presumed not being of igneons origin but being a segregation product.

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