Silica aggregates formed at low temperature and low pressure (LTLP) are distributed widely in the world and have aroused more and more attention for their various applications in many fields. Silica phases that occur at LTLP include α-quartz, α-cristobalite, moganite and opal, often as various kinds of silica aggregates:opalline opal-A, cryptocrystalline opal-CT/C and chalcedony, cryptocrystalline-phanerocrystalline granulous quartz aggregates. These silica aggregates could exist in host rocks with different geneses; however, there still exist some discrepancies and regularities in their occurrence and distribution as well as types and ages of their host rocks, which can provide some guidance and reference not only for the development and utilization of these resources but also for the discussion of their genesis. In this paper, discrepancy and regularity were summarized based on the available references. Besides determinative influence of geological environment on the existing form and occurrence of silica aggregates, the environment plays an important role. Thus, we should combine paragenetic minerals which can reflect some information of geological activities to evaluate the existing form and occurrence of silica aggregates in specific regions.