| http://www.w3.org/ns/prov#value | - The starting materials were a series of volatile-free synthetic glasses obtained by heating a mixture of appropriate reagent grade chemicals (oxides, carbonates or hydroxides) corresponding to ~76 wt% haplogranite (35 wt% SiO2, 40 wt% NaAlSi3O8 and 25 wt% KAlSi3O8), ~8 wt% anorthite, ~15 wt% biotite (with a 1:1 molar ratio of Mg/Fe) and ~1 wt% total trace elements, so selected as to avoid peak int
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