Nelenite | |
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![]() Nelenite (brown) and franklinite (metallic, black), from Franklin, Franklin Mining District, Sussex County, New Jersey, US | |
General | |
Category | Phyllosilicate |
Formula (repeating unit) | (Mn,Fe)16As3Si12O36(OH)17 or (Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3] |
IMA symbol | Nln[1] |
Strunz classification | 9.EE.15 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/m |
Unit cell | a = 23.24, b = 13.41 c = 7.38 [Å]; β = 105.21°; Z = 2 |
Identification | |
Color | Light to medium brown |
Crystal habit | Coarsely granular to massive |
Cleavage | Perfect on {0001} |
Mohs scale hardness | 5 |
Luster | Vitreous, resinous |
Streak | Light brown |
Diaphaneity | Transparent |
Specific gravity | 3.46 |
Optical properties | Uniaxial (-) |
Refractive index | nω = 1.718 nε = 1.700 |
Birefringence | δ = 0.018 |
Pleochroism | Visible 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]
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