Figure 1

Experimental and natural particles used for demonstration. (a) Schematic cooling curves for the crucible-contraction run samples “Cair”, “Cinter”, “Cstart” and “Cwater”. SEM scans show typical particles from the analysed samples: (b) “Cair”, (c) “Cinter”, (d) “Cstart”, (e) “Cwater”, (f) “B”, (g) “D”, (h) “R”, (i) “F”, (j) “V”, (k) “U”, (l) “NATcp”, (m) “NATang”.