General Information:
Chemical Formula:
Mn++9Zn6Sb+++++2Si4O28
Composition:
(Molecular Weight = 1,690.61 gm)
Manganese 29.25 % Mn
Zinc 23.21 % Zn
Silicon 6.65 % Si
Antimony 14.40 % Sb
Oxygen 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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