herderite definition

  • noun:
    • A monoclinic-prismatic mineral containing beryllium, calcium, fluorine, oxygen, and phosphorus.
    • A rare fluophosphate of glucina, in little white crystals.
    • an unusual fluophosphate of beryllium and calcium, happening in white or yellowish transparent crystals in Saxony, as well as Stoneham in Maine, U. S.
    • It happens in addition at Paris and Hebron, Maine. It's shown by Penfield to be monoclinic (pseudo-orthorhomnic) in crystallization, with a composition expressed by the formula Ca [Be (F, OH)] PO4. Purefluor-herderite have not yet already been seen; the mineral from Paris is a hydrofluor-herderite, hence from Hebron a hydroherderite.
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