Lennilenapeite Mineral Data

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)_44.7·16.9(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)

Search for Lennilenapeite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Lennilenapeite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Lennilenapeite Mineral Data :

Ask about Lennilenapeite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: