Nelenite

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CategoryPhyllosilicate minerals
Formula(Mn,Fe)16As3Si12O36(OH)17 or
(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]
IMA symbolNln[1]
Strunz classification9.EE.15
Nelenite
Nelenite (brown) and franklinite (metallic, black), from Franklin, Franklin Mining District, Sussex County, New Jersey, US
General
CategoryPhyllosilicate minerals
Formula(Mn,Fe)16As3Si12O36(OH)17 or
(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]
IMA symbolNln[1]
Strunz classification9.EE.15
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 23.24, b = 13.41
c = 7.38 [Å]; β = 105.21°; Z = 2
Identification
ColorLight to medium brown
Crystal habitCoarsely granular to massive
CleavagePerfect on {0001}
Mohs scale hardness5
LusterVitreous, resinous
StreakLight brown
DiaphaneityTransparent
Specific gravity3.46
Optical propertiesUniaxial (-)
Refractive indexnω = 1.718 nε = 1.700
Birefringenceδ = 0.018
PleochroismVisible ε = colorless and ω = light brown
References[2][3][4]

Nelenite is a rare manganese iron phyllosilicate arsenate mineral found in Franklin Furnace, New Jersey.

Its chemical formula is (Mn,Fe)16As3Si12O36(OH)17 or (Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3][2]

References

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