Lennilenapeite Mineral Data

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)_44.7ï¿½16.9(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.

Name Pronunciation:

Lennilenapeite + Pronunciation

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:

Triclinic Space 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

Diaphaneity:

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

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2134,KC= 0.2178
Ncalc = 1.59

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:

Bulk Density (Electron Density)=2.68 gm/cc
note: Specific Gravity of Lennilenapeite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

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)
Concentration of Lennilenapeite per GRapi unit = 2.81 (%)

Estimated Radioactivity from Lennilenapeite - barely detectable

Lennilenapeite Classification

Dana Class:

74.01.01.02 (74)Phyllosilicate Modulated Layers

(74.01)with joined islands

(74.01.01)Stilpnomelane group

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

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

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

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

74.01.01.05 Middendorfite! K3Na2Mn5Si12(O,OH)36•2H2O P 2₁/m or P 2₁ Mono

Strunz Class:

09.EG.40 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.40 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216•6(H2O) pseudo-HEX P1 or P1 Tri

09.EG.40 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho

09.EG.40 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216•16(H2O) Unk (pseudo-HEX) Tri

09.EG.40 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m

09.EG.40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27•n(H2O) P1 1

Other Lennilenapeite Information

References:

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

See Also:

Links to other databases for Lennilenapeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Lennilenapeite

K6-7(Mg,Mn,Fe++,Fe+++,Zn)48(Si,Al)72(O,OH)216•16(H2O)
Dana No: 74.01.01.02 Strunz No: 09.EG.40
Locality:

Notes:

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