Abstract
AbstractHydroxylherderite, Ca2Be2P2O8(OH)2, is among the most common beryllophosphates in nature and could play a substantial role in Be geochemical cycle. Hydroxylherderite P–T stability and crystal structure behavior were studied under extreme conditions (up to 750°C/100 GPa) using in situ single‐crystal and powder X‐ray diffraction and Raman spectroscopy. The mineral demonstrated high stability under high‐pressure conditions (up to ∼100 GPa) without any phase transitions. Under high‐temperature conditions, it was stable up to about 700°C, when it decomposed with the formation of fluorapatite Ca5(PO4)3F and hurlbutite CaBe2P2O8. The beryllophosphate member of the gadolinite supergroup is the most stable mineral (material) under high‐pressure conditions, compared to aluminum‐, boro‐ and beryllosilicates.
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