Black, Green, Black, Green, Black, Green, gray, Black, Green, gray
Yellow, Brownish, Reddish, Green, Brownish, Yellow, Green, Yellow, Red
Not Available, Not Available, gray, Green
White, Yellow
Uneven, Brittle, Metallic, Brittle, Metallic
Uneven
NaNa2(Fe++4Fe+++)Si8O22(OH)2
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)