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Table 1

Experimental conditions and mineralogy of annealed samples.

Temperature (K) Heating Rate (K/hour) Run Duration at T (hours) Mineralogy (relative fractions of the crystalline phases in %)
Forsterite Clinoenstatite Orthoenstatite Protoenstatite Cristobalite

973 300 360 100
993 300 240 100
1013 300 240 27 14 59
1033 300 288 22 18.5 57.5
1176 12 000 15 19 18 63
1273 7 0 25 27 48
1273 333 20 25 17 58
1273 12 000 2 18 19 63
1378 12 000 15 18 79 2

Notes. Relative fractions of minerals are determined from XRD patterns. An error of  ± 5% is typically considered for the method employed (see text).

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