Plumbogummite


Composition:

PbAl3(PO4)(PO3OH)(OH)6

Crystal System : Trigonal
Colours: Light blue, gray-white, yellow-gray, yellow, yellow-brown, red-brown, greenish, bluish, dark blue-gray;
Lustre : Greasy
Hardness : 4.50-5.0
Specific Gravity : 4.01