Plumbogummite
Plumbogummite
– PbAl3(PO4)(PO3OH)(OH)6
Apatite
Talc (1)Diamond (10)
Softer than glass. A steel knife scratches it.
Did you know?
Its name joins the Latin words for lead and for gum, because it so often forms smooth, rounded, gummy looking blue crusts rather than crystals, frequently laid right over green pyromorphite.