Formula: Pb4Fe(AsO3)2Cl4.2H2O
Origin of name: for Neal Leo Yelden, American mineral collector
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell: a = 6.54 Å, b = 10.24 Å, c = 5.58 Å, a = 96.2°, b = 89.4°, g = 97.7°
Colour: orange
Diaphaneity:
Luster: adamantine
Habit: crystals bladed or stout to elongated prismatic, in clusters
Hardness:
Specific gravity: 5.88
Cleavage: none
Tenacity:
Streak: light orange
Synonyms/varieties:
Comments:
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