Formula: (Pb,Y,U,Ca)2-xNb2O6(OH)
Origin of name: from Latin plumbum = lead and pyrochlore
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: greenish yellow to red, dark brown centers
Diaphaneity:
Luster:
Habit: crystals octahedral, small grains
Hardness:
Specific gravity:
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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