Franklinphilite Mineral Data

Franklinphilite Mineral Data +

General Franklinphilite Information

Chemical Formula:

(K,Na)4(Mn++,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O)

Composition:

Molecular Weight = 8,207.63 gm

Potassium 1.24 % K 1.49 % K₂O

Sodium 0.31 % Na 0.42 % Na₂O

Magnesium 3.91 % Mg 6.48 % MgO

Manganese 17.47 % Mn 22.56 % MnO

Aluminum 1.91 % Al 3.60 % Al₂O₃

Zinc 4.78 % Zn 5.95 % ZnO

Iron 5.51 % Fe 7.88 % Fe₂O₃

Silicon 20.81 % Si 44.51 % SiO₂

Hydrogen 0.80 % H 7.11 % H₂O

Oxygen 43.28 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_2.6Na_1.1Mn²⁺_26.1Mg_13.2Zn₆Fe³⁺_2.7Si_60.8Al_5.8Fe³⁺_5.4O_163.2(OH)_52.8·6(H₂O)

Environment:

Metamorphosed, weathered zinc deposit. The manganese analog of stipnomelane.

IMA Status:

Approved IMA 1992

Locality:

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

Name Origin:

Named after its locality and from the Greek philos = 'friend.' The 'friends of Franklin' are those scientific investigators who helped study the unique mineralogy and geology of th is deposit.

Synonym:

IMA1990-050

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Franklinphilite Crystallography

Axial Ratios:

a:b:c =0.5775:1:3.8253

Cell Dimensions:

a = 5.521, b = 9.56, c = 36.57, Z = 0.375; alpha = 90°, beta = 90°, gamma = 90° V = 1,930.19 Den(Calc)= 2.65

Crystal System:

TriclinicSpace Group: pseudo-HEX P1 or P1

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

By Intensity(I/I_o): 12.3(1), 2.583(0.4), 2.737(0.3),

Physical Properties of Franklinphilite

Cleavage:

[001] Perfect

Color:

Dark brown, Black.

Density:

2.6 - 2.8, Average = 2.7

Diaphaniety:

Subtranslucent to opaque

Fracture:

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

Habit:

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

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

light brown

Optical Properties of Franklinphilite

Gladstone-Dale:

CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2152,KPDmeas= 0.2112,KC= 0.2196

Optical Data:

Biaxial (-), a=1.545, b=1.583, g=1.583, bire=0.0380, 2V(Calc)=0, 2V(Meas)=10.

Pleochroism (x):

yellow.

Pleochroism (y):

deep brown.

Pleochroism (z):

deep brown.

Calculated Properties of Franklinphilite

Electron Density:

r_electron=2.60 gm/cc
note: r_{Franklinphilite}=2.65 gm/cc.

Fermion Index

Fermion Index = 0.01696
Boson Index = 0.98304

Photoelectric:

PE_{Franklinphilite}= 9.46 barns/electron
U=PE_{Franklinphilite} x r_electron= 24.61 barns/cc.

Radioactivity:

GRapi = 17.54 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Franklinphilite - barely detectable

Franklinphilite Classification

Dana Class:

74.1.1.3 (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.17-45 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 Franklinphilite Information

References:

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

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Franklinphilite

(K,Na)4(Mn++,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O)
Dana No: 74.1.1.3 Strunz No: VIII/H.17-45
Locality:

Notes: