General Information:
Chemical Formula:(Zn,Fe)S
Composition:(Molecular Weight = 97.46 gm)Zinc 67.10 %
ZnSulfur 32.90 %
S Empirical Formula: ZnS
Environment:In sulfide ore veins in all rock classes.
IMA Status:Approved IMA 1960
Locality:Notable localities are Santander, Spain and Joplin, Kansas.
Name Origin:From the Greek sphaleros - "misleading."
Physical Properties: Cleavage:[110] Perfect, [110] Perfect, [110] Perfect
Color:brown, yellow, red, green, or black.
Density:3.9 - 4.2, Average = 4.05
Diaphaniety:Translucent to transparent
Habits:Euhedral Crystals - Occurs as well-formed crystals showing good external form., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Colloform - Forming from a ge l or colloidal mass.
Hardness:3.5-4 - Copper Penny-Flourite
Luminescence:Fluorescent and triboluminescent.
Luster:Resinous - Greasy
Streak:brownish white
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