This is probably related to the scarcity of silica on Moon and with fast evaporation of molten silica in vacuum. Quartz was found in felsitic clasts in crystals having a needle shape, which seem to result from the transformation of original tridymite crystals. Quartz was also found in few rare lunar granite samples. The partial inversion of cristobalite into tridymite has been sometimes observed in those basalts. Although they are rare, small, and difficult to study, lunar zircons proved to be extremely significant to date lunar samples, particularly the oldest lunar rocks, which constitute the lunar mountains.
Zircons also record well fission tracks.
The main source of lunar zircons is the famous lunar granites with high silica content, which seem particularly rare. However, the majority of lunar zircons are found in single grains in lunar soils and breccias. This is due to the scarcity of lunar granites and the longevity of zircon. They were also found inside metamorphised rocks inclusions inside basalts. In that case, they probably result from the transformation of tranquillityite.