diadochite


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diadochite

[dī′ad·ə‚kīt]
(mineralogy)
Fe2(PO4)(SO4)(OH) · 5H2O A brown or yellowish mineral consisting of a basic hydrous ferric phosphate and sulfate.
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Vitreous stalactitic masses of diadochite of colloidal origin were once found on Level 320 of the Contacto vein, and large masses have been found in other stoped-out tin veins.
Associated minerals are: epsomite, members of the "hair salt" family (the most abundant of which is apjohnite), gypsum, jarosite, tschermigite, diadochite and four other new species: levinsonite-(Y), zugshunstite-(Ce), the probable ammonium analogue of slavikite and an iron phosphate.
Occurrence: Associated minerals are: pyrite, quartz, gypsum, jarosite, diadochite, and another new phosphate.
Under BSE, diadochite shows well-shaped 5-15 [micro]m, pseudohexagonal (triclinic) tabular to columnar prismatic-pyramidal crystals which locally resemble feldspars.
Formerly called diadochite, the name destinezite has been reinstated for well-crystallized material after study of the Alum Cave Bluff material.