General Information:
Chemical Formula:K6-7(Mg,Mn,Fe++,Fe+++,Zn)48(Si,Al)72(O,OH)216·16(H2O)
IMA Status:Approved IMA 1982
Locality:Franklin, Sussex County, New Jersey, USA.
Name Origin:Named for the Lenni Lenape Native American tribe, who first inhabited the type locality region.
Physical Properties: Cleavage:[001] Perfect, [1] Indistinct
Color:brownish black, green, light green, or dark brown.
Density:2.72
Diaphaniety:Translucent to opaque
Hardness:3 - Calcite
Luster:Vitreous - Resinous
Streak:brown
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