General Information:
Chemical Formula:(Zn,Mn++)2Mn++++5O12·4(H2O)
Composition:(Molecular Weight = 668.48 gm)Manganese 41.91 %
MnZinc 18.59 %
ZnHydrogen 1.21 %
H Oxygen 38.29 %
O Empirical Formula: Zn1.9Mn2+0.1Mn4+5O12·4(H2O)
Environment:Oxidized material derived from the orebody outcrop.
Locality:Sterling Hill mine, Ogdensburg, Sussex County, New Jersey, USA.
Name Origin:Named for Samuel Woodruff, late-nineteenth-century miner and mineral collector at Franklin, who collected and preserved many of the finest specimens found at that locality.
Physical Properties: Cleavage:None
Color:brown, iron black, or black brown.
Density:4.01
Diaphaniety:Opaque
Habits:Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Pulverulent - Forms a loose, poorly-coherent powdery mass.,
Hardness:4.5 - Between Fluorite and Apatite
Luster:Earthy (Dull)
Streak:brownish
More details...
