General Information:
Chemical Formula:(Mg,Fe++)3Si2O5(OH)4
Composition:(Molecular Weight = 300.77 gm)Magnesium 18.18 %
MgIron 13.93 %
FeSilicon 18.68 %
SiHydrogen 1.34 %
H Oxygen 47.88 %
O Empirical Formula: Mg2.25Fe2+0.75(Si2O5)(OH)4
IMA Status:Approved IMA 1962
Locality:Antigorio, Italy
Name Origin:Named after its locality. From the Latin, serpens - "snake."
Physical Properties: Cleavage:[001] Good
Color:green, gray, bluish gray, brown, or black.
Density:2.5 - 2.6, Average = 2.54
Diaphaniety:Translucent to Subopaque
Habits:Platy - Sheet forms (e.g. micas)., Massive - Uniformly indistinguishable crystals forming large masses., Scaly - Morphology like fish scales.
Hardness:3.5-4 - Copper Penny-Flourite
Luster:Vitreous - Greasy
Streak:greenish white
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