Nelenite

Nelenite
Nelenite (brown) and franklinite (metallic, black), from Franklin, Franklin Mining District, Sussex County, New Jersey, US
General
CategoryPhyllosilicate
Formula
(repeating unit)
(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]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Mindat.org - Nelenite
  3. ^ Webmineral.com - Nelenite
  4. ^ Handbook of Mineralogy - Nelenite

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