Antigorite

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Magnesium silicate (Mg3Si2O5(OH)4), monoclinic, the higher-temperature member of the serpentine group, forming only above roughly 250°C — distinct from the lower-temperature serpentine polymorphs chrysotile and lizardite. Traditionally associated with: grounded transformation and protection, echoing its formation from the metamorphic reworking of ancient oceanic rock. Collectors and practitioners may keep this specimen for study, display, meditation, journaling, or as a personal symbolic reminder — not as medical care.