Manganese-bearing silicate minerals from metamorphosed manganese formations of India. I. Juddite

1970 ◽  
Vol 37 (290) ◽  
pp. 708-716 ◽  
Author(s):  
Supriya Roy
Keyword(s):  
Composition Range ◽  
Axial Plane ◽  
Refractive Indices ◽  
Manganese Ore ◽  
Silicate Minerals ◽  
Partial Miscibility ◽  
Plane Normal

SummaryThe manganiferous amphibole juddite has been reported by a number of workers from metamorphosed manganese formations of India. The mineral is developed at the contact of pegmatite and gondite, and associated characteristically with blanfordite (manganoan aegirine-augite) and winchite (manganoan richterite-tremolite). The range of the refractive indices of the mineral and the orientation of the optic axial plane normal to (010) suggest the mineral to be of magnesioriebeckite composition. The 100 Mn2+:(Mn2++Mg+Fe2+) and 100 Fe3+:(Fe3++Alvi+Ti) ratios plotted in the glaucophane-magnesioriebeckite diagram show that eight out of nine analyses (eight new) are grouped under magnesioriebeckite composition range. It may thus be concluded that the juddites generally refer to (manganoan) magnesioriebeckite compositions. In some cases, however, the composition of juddite shows considerable departure from ideal magnesioriebeckite composition and the juddite and winchite (manganoan tremolite-richterite) show evidences of compositional transition, indicating partial miscibility. The juddites have been formed by the interaction of pegmatitic fluid on manganese ore, gondite, and other country rocks such as mica schists and diopside-forsterite marble.

Molar volumes and refractivities of highly concentrated solutions of ammonium and potassium thiocyanates in water and dimethylsulphoxide

1988 ◽  
Vol 66 (9) ◽  
pp. 2244-2249 ◽  
Author(s):  
Petr Pacák ◽  
Zdenĕk Kodejš
Keyword(s):  
Composition Range ◽  
Apparent Molar Volumes ◽  
Refractive Indices ◽  
Dilute Solutions ◽  
Concentrated Solutions ◽  
Lorenz Equation ◽  
Molar Volumes ◽  
Solvent Interactions ◽  
Density Measurements ◽  
Concentration Dependences

Densities and refractive indices of highly concentrated solutions of ammonium and potassium thiocyanates in water and dimethylsulphoxide have been measured at 333.2 K in the composition range from xs = 0.01 up to saturated solutions. Molar volumes and apparent molar volumes have been calculated from density measurements and their concentration dependences are discussed. All the systems are volumetrically non-ideal and exhibit negative deviations from additivity. The molar refractivities were calculated from the refractive indices using the Lorentz–Lorenz equation. The refractivity values of individual ions were estimated in infinitely dilute solutions and were used for discussion of ion–solvent interactions.

scholarly journals Study of Refractive Indices and Its Theories for Mixtures of N, N-Diethylethanamine and Acetates

2020 ◽  
Vol 12 (3) ◽  
pp. 363-370
Author(s):  
P. Tyagi ◽  
K. Kumar ◽  
M. Rani ◽  
N. Sabharwal
Keyword(s):  
Experimental Data ◽  
Methyl Acetate ◽  
Butyl Acetate ◽  
Composition Range ◽  
Polynomial Equation ◽  
Carbon Chain ◽  
Refractive Indices ◽  
Carbon Chain Length ◽  
Propyl Acetate ◽  
Empirical Correlations

This paper reports the refractive indices ( ) of N,N-diethylethanamine + methyl acetate, ethyl acetate, propyl acetate, butyl acetate and pentyl acetate at 298.15 K and at different composition range. The various empirical correlations like Arago-Biot (AB), Gladstone-Dale (GD), Lorentz-Lorenz (L-L) Heller (H), Weiner (W), Newton (Nw) and Erying-John (E-J) were applied to experimental data for estimating theoretical value of refractive indices. For an equimolar mixture, the predicted deviation in refractive index values is consistent well with the experimental data. It has been found that the interactions between amine and different esters decrease when carbon chain length in ester increases. Also refractive indices are affected with change in temperature. To evaluate the standard deviation, RK polynomial equation was fitted to the measured refractive indices data.

Polymer Blends made from Ionomer and Ionomer Precursor Polymer

1996 ◽  
Vol 461 ◽  
Author(s):  
M. A. Bellinger ◽  
X. Ma ◽  
L. Tsou ◽  
J. A. Sauer ◽  
M. Hara
Keyword(s):  
Methyl Methacrylate ◽  
Polymer Blends ◽  
Interfacial Adhesion ◽  
Composition Range ◽  
Refractive Indices ◽  
Positive Deviation ◽  
Fine Dispersion ◽  
Matrix Polymer ◽  
Precursor Polymer ◽  
The Matrix

ABSTRACTRigid-rigid blends made of an ionomer and an ionomer precursor polymer, based on either polystyrene (PS) or poly(methyl methacrylate)(PMMA), were studied. A positive deviation from the rule of mixtures in both strength and toughness was observed over the entire composition range; and an especially significant enhancement was observed at low ionomer composition (e.g., 10 wt.%). This is attributed to a fine dispersion of the rigid ionomer phase in the matrix polymer together with good interfacial adhesion between the phases. The adhesion arises from entanglements due to athermal interactions between the same monomeric units of both the ionomer and the ionomer precursor. In addition, all the blend samples are found to be transparent due to similar refractive indices of the two components.

scholarly journals Densities, Viscosities and Refractive Indices of Ternary System Cyclohexane + Cyclohexanol + Cyclohexanone at 293.15, 298.15 and 303.15 K

2019 ◽  
Vol 70 (4) ◽  
pp. 1204-1209
Author(s):  
Maria Magdalena Budeanu ◽  
Vasile Dumitrescu
Keyword(s):  
Refractive Index ◽  
Ternary System ◽  
Linear Equation ◽  
Viscous Flow ◽  
Atmospheric Pressure ◽  
Composition Range ◽  
Refractive Indices ◽  
Mixing Rules ◽  
Experimental Values

Densities (r), viscosities (h) and refractive indices (nD) of the ternary system cyclohexane + cyclohexanol + cyclohexanone were measured at 293.15, 298.15 and 298.15 K and atmospheric pressure, over the whole composition range. The experimental values of densities and viscosities were correlated with temperature using a linear equation and Guzman equation respectively. Viscosity results were fitted with Grunberg-Nissan equation and Heric-Brewer equation. Different refractive index mixing rules (Arago-Biot, Dale-Glastone, Newton and Lorentz-Lorenz) were studied for this ternary system. The functions of activation of viscous flow were also calculated and their variations with compositions have been discussed.

Computational Approach of Molar Refraction, Molecular Radius and Internal Pressure of a Binary Mixture - Molecular Interaction Studies

2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Anil Kumar K. ◽  
Srinivasu Ch. ◽  
Siva Rama Krishna J. ◽  
Jitendra M.S.N.V.
Keyword(s):  
Internal Pressure ◽  
Composition Range ◽  
Liquid Mixture ◽  
Polynomial Equation ◽  
Molar Refraction ◽  
Measured Data ◽  
Computational Approach ◽  
Refractive Indices ◽  
Excess Parameters ◽  
Molecular Radius

Refractive indices and molar volume of binary liquid mixture of 1, 4-dioxane with 1-butanol were measured over the entire composition range at T= (298.15, 303.15, 308.15, 313.15 & 318) K using Anton Paar and Abbemat Refractometer. Basing empirical formulae and the measured data were utilized to evaluate the molar refraction (Rm), molecular radii (r), internal pressure (pi) along with their excess parameters. The computed results of RmE, rE and piE were fitted to the Redlich–Kister polynomial equation and focused on the molecular interactions present in the mixture.

Molar Refractivities of Solutions of the Eutectic Silver Nitrate-Thalium Nitrate Mixture in Water and Dimethyl Sulfoxide

1992 ◽  
Vol 57 (7) ◽  
pp. 1353-1361 ◽  
Author(s):  
Zdeněk Kodejš ◽  
Hana Špalková ◽  
Guiseppe A. Sacchetto
Keyword(s):  
Composition Dependence ◽  
Composition Range ◽  
Eutectic Mixture ◽  
Refractive Indices ◽  
Solvent Interactions ◽  
Molten Electrolyte ◽  
Density Values ◽  
Molecular Solvents ◽  
Nitrate Mixture ◽  
The Ideal

Refractive indices of the (Ag0.516, Tl0.484)NO3-H2O and (Ag0.516, Tl0.484)NO3-DMSO solutions have been measured at 90 °C over the whole composition range extending from the molecular solvents to the molten electrolyte. The molar refractivities of the melts were calculated from the refractive indices and a set of density values interpolated at the same temperature. Both systems were found to exhibit deviations from the ideal additive behaviour. The molar refractivities of the electrolyte (eutectic mixture AgNO3-TlNO3) and the solvent were calculated and their composition dependence and the deviations from the additivity are compared and discussed. The molar refractivity was found to be a complex, a less indicative, and a less sensitive indicator of the types and strength of ion-solvent interactions in these melts than the molar volume.

Manganese silicate minerals from Chikla, Bhandara District, India

1956 ◽  
Vol 31 (234) ◽  
pp. 236-244 ◽  
Author(s):  
S. A. Bilgrami
Keyword(s):  
Optical Properties ◽  
Manganese Ore ◽  
Chemical Analyses ◽  
Manganese Silicate ◽  
Silicate Minerals

SummaryBlanfordite (a manganiferous aegirine), rhodonite, alurgite, manganophyllite, and piemontite are deseribed from a pegmatite that cuts a manganese ore band in the Sitasaongi mine, Chikla, Bhandara district, India. In addition, rhodonite and piemontite are described from gneiss and schist areas. Chemical analyses and optical properties of all these minerals are given and their possible origin suggested.

Taneyamalite, (Na,Ca)(Mn2+,Mg,Fe3+,Al)12Si12 (O,OH)44, a new mineral from the Iwaizawa mine, Saitama Prefecture, Japan

1981 ◽  
Vol 44 (333) ◽  
pp. 51-53 ◽  
Author(s):  
Satoshi Matsubara
Keyword(s):  
Empirical Formula ◽  
Unit Cell ◽  
Refractive Indices ◽  
New Mineral ◽  
Manganese Ore ◽  
Ore Deposit ◽  
X Ray ◽  
Light Yellow ◽  
Cell Data ◽  
Unit Cell Data

AbstractTaneyamalite, (Na,Ca)(Mn2+,Mg,Fe3+,Al)12 Si12(O,OH)44, is a Mn2+-dominant analogue of howieite, and has been found in the metamorphosed bedded manganese ore deposit of the lwaizawa mine, Saitama Prefecture, Japan. It is triclinic, P1 or P, a 10.198(1), b 9.820(1), c 9.485(1) Å, α 90° 30(1)′, β 70° 32(1)′, γ 108° 34(1)′, Z = 1. The strongest X-ray powder diffractions are: 9.29(80)010, 7.99(35)10, 4.62(50)020, 3.65(40)120, 3.273(100)30, 3.081(50)11, 2.790(35)31, 2.630(28)023, 2.216(35)014, 43. Taneyamalite occurs in association with minor bannisterite as small seams in a caryopilite mass or as a fissure mineral cutting a hematite-quartz mass. It is greenish grey-yellow, lustre vitreous. Streak light yellow. Cleavage {010}, perfect. H. (Mohs) about 5. Calculated sp. gr. 3.30 (on unit cell data and normalized empirical formula), 3.25 (after the Gladstone-Dale Law using the revised data of Mandarino, 1976). It is optically biaxial negative, 2Vα about 70°. The refractive indices: α = 1.646(2), β = 1.664(2), γ = 1.676(2). Extinction is nearly parallel, sign of elongation positive. Pleochroism distinct: α = β nearly colourless, γ pale yellow. Absorption: α ≈ β < γ.

Optical properties of olivines from Ubekendt Island, west Greenland

1941 ◽  
Vol 26 (172) ◽  
pp. 11-15 ◽  
Author(s):  
P. M. Game
Keyword(s):  
Optical Properties ◽  
West Coast ◽  
Composition Range ◽  
Relative Accuracy ◽  
Refractive Indices ◽  
Relative Speed ◽  
The West ◽  
West Greenland ◽  
The Subject ◽  
Basaltic Lavas

The olivines, which are the subject of this note, were obtained from a series of basaltic lavas and dikes on Ubekendt island, which lies off the west coast of Greenland in latitude 71 ° N., longitude 54 ° W.The optical properties of the olivines were investigated in order to determine any range in composition; such variations might have been expected in the very thick lava series. From this aspect, however, the results are disappointing, the composition range being small. However, it is thought that the results may have a certain interest in showing the relative accuracy obtainable in the measurement of refractive indices and optic axial angles. The usual determinative methods have been slightly varied. It is the purpose of this note to describe these variations and to compare the relative speed and scope of the method used with those obtained by other methods.

Fold Structures in the Dalradian Rocks of Knapdale, Argyllshire

1959 ◽  
Vol 96 (3) ◽  
pp. 221-229 ◽  
Author(s):  
John L. Roberts
Keyword(s):  
Stress Field ◽  
Axial Plane ◽  
The Other ◽  
Tetragonal Symmetry ◽  
Maximum Compressive Stress ◽  
Plane Field ◽  
Plane Normal ◽  
South West ◽  
Field Evidence ◽  
The Common

AbstractIn the Dalradian rocks of Knapdale in south-west Argyll two groups of minor folds have been developed which share the same axial plane; their fold axes lie at right angles to each other within the common axial plane. Field evidence indicates that the two fold groups are strictly contemporaneous. One group of minor folds plunges at 40° to 020° N., and the other group plunges at 45° to 235° N., the common axial plane dipping at 70° to 305° N. Major structures parallel to both sets of minor folds are developed in the area. The fabric diagram of the fold groups shows tetragonal symmetry and this is taken to indicate that the stress field responsible for the deformation had itself tetragonal symmetry. The maximum compressive stress acted almost horizontally in a N.W.–S.E. direction while extension took place equally in all directions in a plane normal to the axis of maximum compression. The relations of contemporaneous fold structures to three basic strain patterns are briefly discussed.

Sign in / Sign up

Export Citation Format

Share Document