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While polestones are produced via mining, a significant source of them on Roshar is the harvesting of the [[gemheart]]s that grow inside [[greatshell]]s. Larger species of greathshell, like [[chasmfiend]]s, produce gemhearts of great size, which are incredibly useful in Soulcasting as a larger stone is less likely to break from the strain.{{book ref|sa1|13}} This trait however has led to many species of greatshells, such as the [[lanceryn]], to go extinct.{{book ref|sa1|36}} The exact method by which gemhearts are grown is not understood, though it is known to be caused by a leak from the [[Spiritual Realm]] into the [[Physical Realm|Physical]], and is analogous, though not identical, to the production of [[atium]] in the [[Pits of Hathsin]] on [[Scadrial]].{{qa ref|949|4}} Although they may have flaws, gemheart polestones have virtually no impurities, unlike their conventionally mined counterparts.{{qa ref|1088|18}}