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.