Nelenite Mineral Data

Nelenite Mineral Data +

General Nelenite Information

Chemical Formula:

(Mn,Fe++)16Si12As+++3O36(OH)17

Composition:

Molecular Weight = 2,312.59 gm

Magnesium 0.11 % Mg 0.17 % MgO

Manganese 22.57 % Mn 29.14 % MnO

Zinc 2.83 % Zn 3.52 % ZnO

Iron 13.28 % Fe 17.09 % FeO

Silicon 14.57 % Si 31.18 % SiO₂

Arsenic 9.40 % As 12.40 % As₂O₃

Hydrogen 0.72 % H 6.43 % H₂O

Oxygen 36.53 % O

______ ______

100.00 % 99.93 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_9.5Fe²⁺_5.5ZnMg_0.1As_2.9Si₁₂O_36.3(OH)_16.5

Environment:

In a metamorphosed stratiform zinc deposit. Dimorphous with schallerite.

IMA Status:

Approved IMA 1984

Locality:

From Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Joseph A. Nelen, chemist at the Smithsonian Institution, Washington, D.C., USA.

Synonym:

Ferroschallerite

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Nelenite Crystallography

Axial Ratios:

a:c = 1:6.37054

Cell Dimensions:

a = 13.418, c = 85.48, Z = 12; V = 13,328.18 Den(Calc)= 3.46

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.552(1), 1.677(0.6), 1.723(0.5),

Physical Properties of Nelenite

Cleavage:

[001] Perfect

Color:

Brown.

Density:

3.46

Diaphaniety:

Transparent to Translucent

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luster:

Vitreous - Resinous

Streak:

light brown

Optical Properties of Nelenite

Dichroism (e):

colorless.

Dichroism (w):

light brown.

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2049,KPDmeas= 0.2049,KC= 0.2113

Optical Data:

Uniaxial (-), e=1.7, w=1.718, bire=0.0180.

Calculated Properties of Nelenite

Electron Density:

r_electron=3.33 gm/cc
note: r_Nelenite=3.46 gm/cc.

Fermion Index

Fermion Index = 0.01106
Boson Index = 0.98894

Photoelectric:

PE_Nelenite= 18.09 barns/electron
U=PE_Nelenite x r_electron= 60.31 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nelenite is Not Radioactive

Nelenite Classification

Dana Class:

72.4.1b.3 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.4)with 4-, 6-, and 12-membered rings

(72.4.1b)Pyrosmalite group (Friedelite subgroup)

72.4.1b.1 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

72.4.1b.2 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

72.4.1b.3 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m

Strunz Class:

VIII/H.28-40 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.28 - Pyrosmalite series

VIII/H.28-10 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-20 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-30 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

VIII/H.28-40 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m

VIII/H.28-50 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

VIII/H.28-70 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

VIII/H.28-80 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

VIII/H.28-90 Bementite Mn8Si6O15(OH)10 P 2₁/c 2/m

VIII/H.28-100 Varennesite Na8Mn2Si10O25(OH,Cl)2·12(H2O) C mcm 2/m 2/m 2/m

Other Nelenite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

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Nelenite

(Mn,Fe++)16Si12As+++3O36(OH)17
Dana No: 72.4.1b.3 Strunz No: VIII/H.28-40
Locality:

Notes: