Formula: CaBe(PO4)F
Origin of name: From S. van Herder, mining official, Saxony
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless to pale yellow, greenish white
Diaphaneity:
Luster: Vitreous
Habit: Crystals prismatic or tabular; radial fibrous aggregates, botryoidal
Hardness: 5 to 5.5
Specific gravity: 2.95 to 3.01
Cleavage: 1; {110} interrupted
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with hydroxylherderite
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