Clintonite Mineral Data

Clintonite Mineral Data

General Clintonite Information

Chemical Formula:

Ca(Mg,Al)3(Al3Si)O10(OH)2

Composition:

Molecular Weight = 415.81 gm

Calcium 9.64 % Ca 13.49 % CaO

Magnesium 12.86 % Mg 21.32 % MgO

Aluminum 22.06 % Al 41.69 % Al₂O₃

Silicon 8.78 % Si 18.79 % SiO₂

Hydrogen 0.48 % H 4.33 % H₂O

Oxygen 46.17 % O

______ ______

100.00 % 99.62 % = TOTAL OXIDE

Empirical Formula:

CaMg_2.2Al_0.7Al_2.7Si_1.3O₁₀(OH)₂

Environment:

Serpentinized limestones and siliceous skarns near contact metamorphic zones.

IMA Status:

Valid Species (Pre-IMA) 1843

Locality:

Amity, Warwick, Orange Co., New York, USA. Link to MinDat.org Location Data.

Name Origin:

Named for De Witt Clinton (1769-1828), American statesman.

Synonym:

Brandesite

Calciotalc

Seybertite

Xanthophyllite

Clintonite Image

Images:

Clintonite

Comments: Several interconnected platy crystals of black clintonite variety xanthophyllite on vuggy matrix.
Location: Green Monster Mountain, Prince of Wales Island, Prince of Wales-Outer Ketchikan Co., Alaska, USA. Scale: 4x3x2 cm.
© John Betts - Fine Minerals

Clintonite Crystallography

Axial Ratios:

a:b:c =0.5808:1:1.1244

Cell Dimensions:

a = 5.306, b = 9.135, c = 10.272, Z = 2; beta = 100.01° V = 490.31 Den(Calc)= 2.82

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.56(1), 3.21(0.7), 2.11(0.7),1.505(0.6), 1.485(0.5), 2.45(0.5), 9.68(0.5),

Crystal Structure:

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Takeuchi Y , Sadanaga R , Acta Crystallographica , 12 (1959) p.945-946, The crystal structure of xanthophyllite, Locality: Chichibu mine, Japan

Physical Properties of Clintonite

Cleavage:

[001] Perfect

Color:

Colorless, Green, Yellow, Red, Reddish brown.

Density:

3 - 3.1, Average = 3.05

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

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

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Pearly

Streak:

colorless

Optical Properties of Clintonite

Gladstone-Dale:

CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.232,KPDmeas= 0.2145,KC= 0.2111

Optical Data:

Biaxial (-), a=1.643-1.648, b=1.655-1.662, g=1.655-1.663, bire=0.0120-0.0150, 2V(Calc)=0-28, 2V(Meas)=2-40. Dispersion none.

Pleochroism (x):

colorless, pale orange, or reddish brown.

Calculated Properties of Clintonite

Electron Density:

r_electron=3.03 gm/cc
note: r_Clintonite=3.05 gm/cc.

Fermion Index

Fermion Index = 0.01731
Boson Index = 0.98269

Photoelectric:

PE_Clintonite= 2.46 barns/electron
U=PE_Clintonite x r_electron= 7.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Clintonite is Not Radioactive

Clintonite Classification

Dana Class:

71.2.2c.2 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2c)Mica Group (Margarite subgroup)

71.2.2c.1 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2c.2 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

71.2.2c.3 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

71.2.2c.4 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

71.2.2c.5 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

71.2.2c.6 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

71.2.2c.7 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

71.2.2c.8 IMA2004-013! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m

Strunz Class:

VIII/H.12-60 VIII - Silicates

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

VIII/H.12 - Mica group, Lepidolite series

VIII/H.12-10 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

VIII/H.12-20 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

VIII/H.12-30 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

VIII/H.12-35 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

VIII/H.12-40 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.12-50 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

VIII/H.12-60 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

Other Clintonite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Clintonite

Ca(Mg,Al)3(Al3Si)O10(OH)2
Dana No: 71.2.2c.2 Strunz No: VIII/H.12-60
Locality:

Notes: