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Herderite
Herderite is a phosphate mineral belonging to the apatite, phosphate group, with formula CaBe. It forms monoclinic crystals, often twinned and variable in colour from colourless through yellow to green. It forms a series with the more common... Wikipedia
Colour: Colourless, pale yellow, greenish-white
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal system: Monoclinic