Formula: Na5Ca4(PO4)4F
Origin of name: for Yevgeny Nefedov, Russian mineralogist
Crystal system: triclinic
Crystal class: 1 or -1
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: vitreous
Habit: aggregates of 0.01 to 0.5 mm grains
Hardness: 4.5
Specific gravity: 3.01
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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