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Molendum Vitri Beads
Globuli globuli vitrei, species: sphaera hyalina pellucida, teres et rotundus, sine bullis et immunditiis conspicuis.
Rotundus rate: ≥ 80% rotunditas rate;
Densitas: 2.4-2.6g/cm3;
Index refractivus: Nd ≥ 1.50;
Compositio: sodium calcii vitri, SiO2 contentus ＞ 68%;
Compressive strength: > 1200n;
Mohs duritia: 6-7.
