Lennilenapeite Mineral Data

Lennilenapeite Mineral Data +

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General Lennilenapeite Information

Chemical Formula:

K6-7(Mg,Mn,Fe++,Fe+++,Zn)48(Si,Al)72(O,OH)216·16(H2O)

Composition:

Molecular Weight = 8,425.53 gm

Potassium 2.51 % K 3.02 % K₂O

Barium 1.14 % Ba 1.27 % BaO

Sodium 0.14 % Na 0.18 % Na₂O

Magnesium 4.21 % Mg 6.98 % MgO

Manganese 9.00 % Mn 11.62 % MnO

Aluminum 2.85 % Al 5.39 % Al₂O₃

Zinc 5.04 % Zn 6.28 % ZnO

Iron 9.15 % Fe 6.40 % FeO / 5.97 % Fe₂O₃

Silicon 20.80 % Si 44.50 % SiO₂

Hydrogen 0.94 % H 8.39 % H₂O

Oxygen 44.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_5.4Ba_0.7Na_0.5Mg_14.6Mn²⁺_13.8Fe²⁺_7.5Zn_6.5Fe³⁺_5.6Si_62.4Al_8.9Fe³⁺_0.7O_171.3(OH)_44.7·16.9(H₂O)

Environment:

Primary and late stage mineral in a metamorphosed zinc deposit.

IMA Status:

Approved IMA 1984

Locality:

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

Name Origin:

Named for the Lenni Lenape Native American tribe, who first inhabited the type locality region.

Lennilenapeite Image

Images:

Lennilenapeite

Comments: Dark greenish brown sub-metallic micaceous lennilenapeite in white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lennilenapeite Crystallography

Crystal System:

TriclinicSpace Group: Unk (pseudo-HEX)

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

By Intensity(I/I_o): 12.11(1), 2.582(0.4), 1.578(0.3),

Physical Properties of Lennilenapeite

Cleavage:

[001] Perfect, [1] Indistinct

Color:

Brownish black, Green, Light green, Dark brown.

Density:

2.72

Diaphaniety:

Translucent to opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3 - Calcite

Luster:

Vitreous - Resinous

Streak:

brown

Optical Properties of Lennilenapeite

Optical Data:

Biaxial (-), a=1.553, b=1.594, g=1.594, bire=0.0410, 2V(Calc)=0, 2V(Meas)=0.

Pleochroism (x):

pale brown or colorless.

Pleochroism (y):

dark brown or dark brown.

Pleochroism (z):

dark brown or dark brown.

Calculated Properties of Lennilenapeite

Electron Density:

r_electron=2.68 gm/cc
note: r_{Lennilenapeite}=2.72 gm/cc.

Fermion Index

Fermion Index = 0.02018
Boson Index = 0.97982

Photoelectric:

PE_{Lennilenapeite}= 13.30 barns/electron
U=PE_{Lennilenapeite} x r_electron= 35.67 barns/cc.

Radioactivity:

GRapi = 35.62 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lennilenapeite - barely detectable

Lennilenapeite Classification

Dana Class:

74.1.1.2 (74)Phyllosilicate Modulated Layers

(74.1)with joined islands

(74.1.1)Stilpnomelane group

74.1.1.1 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27·n(H2O) P1 1

74.1.1.2 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216·16(H2O) Unk (pseudo-HEX) Tri

74.1.1.3 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O) pseudo-HEX P1 or P1 Tri

74.1.1.4 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O) A2/a 2/m

Strunz Class:

VIII/H.17-30 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.17 - Stilpnomelane series

VIII/H.17-10 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O) A2/a 2/m

VIII/H.17-20 Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16·4-12(H2O) Mono

VIII/H.17-30 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216·16(H2O) Unk (pseudo-HEX) Tri

VIII/H.17-40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27·n(H2O) P1 1

VIII/H.17-45 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O) pseudo-HEX P1 or P1 Tri

VIII/H.17-50 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8·2(H2O)(?) C 2/m 2/m

VIII/H.17-60 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O) A2/a 2/m

VIII/H.17-70 Eggletonite Na2Mn8[Si11AlO29](OH)7·11(H2O) Ia or I2/a Mono

VIII/H.17-75 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112·21(H2O) P 2₁/a 2/m

VIII/H.17-80 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2·2(H2O) Unk Ortho

Other Lennilenapeite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Print or Cut-and-Paste your Lennilenapeite Specimen Label here :

Lennilenapeite

K6-7(Mg,Mn,Fe++,Fe+++,Zn)48(Si,Al)72(O,OH)216·16(H2O)
Dana No: 74.1.1.2 Strunz No: VIII/H.17-30
Locality:

Notes: