Kellyite Mineral Data

Kellyite Mineral Data +

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General Kellyite Information

Chemical Formula:

(Mn++,Mg,Al)3(Si,Al)2O5(OH)4

Composition:

Molecular Weight = 323.85 gm

Magnesium 7.51 % Mg 12.45 % MgO

Manganese 25.45 % Mn 32.86 % MnO

Aluminum 8.33 % Al 15.74 % Al₂O₃

Silicon 13.01 % Si 27.83 % SiO₂

Hydrogen 1.24 % H 11.13 % H₂O

Oxygen 44.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_1.5MgAl_0.5Si_1.5Al_0.5O₅(OH)₄

Environment:

Metamorphic Mn deposit with other Mn-silicates.

IMA Status:

Approved IMA 1974

Locality:

Bald Knob, Sparta, Alleghany County, North Carolina, USA. Link to MinDat.org Location Data.

Name Origin:

Named for William Crowley Kelley (1929-), American geologist, University of Michigan.

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Kellyite Crystallography

Axial Ratios:

a:c = 1:2.62528

Cell Dimensions:

a = 5.348, c = 14.04, Z = 2; V = 347.76 Den(Calc)= 3.09

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₃

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

By Intensity(I/I_o): 2.535(1), 3.502(0.85), 7(0.85),

Physical Properties of Kellyite

Cleavage:

[001] Perfect

Color:

Golden yellow, Lemon yellow.

Density:

3.07

Diaphaniety:

Transparent

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Resinous

Streak:

yellowish white

Optical Properties of Kellyite

Dichroism (e):

colorless or greenish yellow.

Dichroism (w):

pale yellow or reddish brown.

Gladstone-Dale:

CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2079,KPDmeas= 0.2093,KC= 0.2179

Optical Data:

Uniaxial (-), e=1.639, w=1.646, bire=0.0070.

Calculated Properties of Kellyite

Electron Density:

r_electron=3.02 gm/cc
note: r_Kellyite=3.07 gm/cc.

Fermion Index

Fermion Index = 0.01379
Boson Index = 0.98621

Photoelectric:

PE_Kellyite= 7.33 barns/electron
U=PE_Kellyite x r_electron= 22.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kellyite is Not Radioactive

Kellyite Classification

Dana Class:

71.1.2c.5 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.2c)Serpentine group (Amesite subgroup)

71.1.2c.1 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

71.1.2c.2 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

71.1.2c.3 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

71.1.2c.4 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

71.1.2c.5 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

71.1.2c.6 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

71.1.2c.7 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

Strunz Class:

VIII/H.27-110 VIII - Silicates

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

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Kellyite Information

References:

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

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Kellyite

(Mn++,Mg,Al)3(Si,Al)2O5(OH)4
Dana No: 71.1.2c.5 Strunz No: VIII/H.27-110
Locality:

Notes: