General Information:
Chemical Formula:Mn++9Zn6Sb+++++2Si4O28
Composition:(Molecular Weight = 1,690.61 gm)Manganese 29.25 %
MnZinc 23.21 %
ZnSilicon 6.65 %
SiAntimony 14.40 %
SbOxygen 26.50 %
O Empirical Formula: Mn2+9Zn6Sb2Si4O28
Environment:Metamorphosed, weathered Zn-Mn deposit.
Locality:Franklin and Sterling Hill, Sussex County, New Jersey, USA.
Name Origin:Named for Pope Yeatman (1861-1953), U. S. Mining engineer.
Physical Properties: Cleavage:[100] Good
Color:clove brown.
Density:4.91 - 5.02, Average = 4.96
Habits:Platy - Sheet forms (e.g. micas)., Anhedral Grains - Granular minerals without the expression of crystal shapes,
Hardness:4 - Fluorite
Luster:Vitreous (Glassy)
Streak:pale brown
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