Clintonite - Occurrence, Properties, and Distribution

Topics Covered

Introduction to Clintonite
Properties of Clintonite
How to Identify Clintonite
Global Distribution
Occurrence of Clintonite and Useful Mineral Association
References

Introduction to Clintonite

Chemical Formula –Ca(Mg,Al)3(Al3Si)O10(OH)2

Clintonite is a member of the mica group, and has a monoclinic system. It was named after De Witt Clinton, an American statesman.

Properties of Clintonite

The following are the key properties of Clintonite:

  • Cell Data
    • Space Group: C2/m
    • a = 5.204
    • b = 9.026
    • c = 9.812
    • β= 100°20'
    • Z = 2

 

  • Crystal Data
    • Monoclinic
    • Point Group: 2/m
    • In tabular pseudohexagonal crystals, complexly twinned, to 2.5cm; foliated or lamellar radiated; massive
    • Twinning: On {001}, twin axis [310] or [310]; spiral polysynthetic twinning
    • X-ray powder pattern: 2.56 (100), 3.21 (70), 2.11 (70), 1.505 (60), 9.68 (50), 2.45 (50), 1.485 (50)

 

  • Chemical Composition
    Elements Content 1 Content 2
    Al2O3 40.00 42.70
    MgO 20.56 20.03
    SiO2 18.78 16.74
    CaO 12.90 13.09
    H2O+ [4.20] 4.49
    Fe2O3 2.85  
    F 2.01  
    FeO 1.86 0.41
    -O = F2 [0.85]  
    TiO2 0.54  
    Total [100.00] 100.31

 

  • Optical Properties
    • Optical Class: Biaxial (-)
    • Pleochroism: X = colorless, pale orange, red-brown
    • Y = Z = pale brownish-yellow, pale green
    • Orientation: Y ˜ a or Y = b; Z = b or ˜ a; X ^ c = 5° - 10°
    • Dispersion: r < v; weak
    • Absorption: Y˜ Z > X
    • α = 1.643-1.648
    • β = 1.655-1.662
    • γ= 1.655{1.663
    • 2V(meas.) = 2°- 40°

 

  • Estimated Properties
    Electron density Bulk density (electron density) = 3.03 g/cm3
    note: Specific gravity of Clintonite = 3.05 g/cm3
    Photoelectric PEClintonite = 2.46 barns/electron
    U = PEClintonite x ρElectron density = 7.46 barns/cm3
    Fermion index Fermion index = 0.01
    Boson index = 0.99
    Radioactivity
    Clintonite is not radioactive

How to Identify Clintonite

Clintonite can be colorless, green, yellow, red, or reddish-brown. It has a transparent to translucent appearance and non-fluorescent luminescence. Its radial, massive crystals radiate from a center without producing stellar forms. It has brittle fractures with pearly luster, colorless streak, and perfect cleavage.

The average density of clintonite is 3.05 g/cm3, and its relative hardness ranges from 4 to 5.

Global Distribution

Clintonite is distributed in the following places:

  • Amity, Edenville, USA
  • Orange Co. New York
  • Crestmore, Riverside Co. California
  • Lyon Co. Nevada
  • Sulzer, Prince of Wales Island, Alaska
  • Mt. Monzoni and at Mts. Castone and Adamello, Trentino-Alto Adige, Italy
  • Pargas district, Finland
  • Akhmatovsk mine, near Zlatoust, Ural Mountains, Russia
  • Chichibu mine, Saitama Prefecture, Japan
  • Ertsberg, Irian Jaya

Occurrence of Clintonite and Useful Mineral Association

Clintotite occurs in chlorite schists, metasomatically altered limestones, and siliceous skarns near contact metamorphic zones.

It is closely associated with dolomite, calcite, chlorite, phlogopite, chondrodite, monticellite, clinopyroxene, vesuvianite, grossular, spinel, and talc.

References

 

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