pesutsüklit

Could you clarify what pesutsüklit refers to? I can’t find a widely recognized term by that name. Is it a real mineral or chemical compound, a misspelling of another term (for example pseudosyklit or pseudotsyklit), or a fictional/conceptual term? If you provide context or a source, I can write a concise, neutral wiki-style article under 300 words. If you’d like, I can also create a brief stub for a hypothetical substance.