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Gladstone-Dale relations

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Journal Article
Published: 13 September 2021
The Canadian Mineralogist (2021) 59 (4): 751–761.
...+ 0.76 Mn 3.48 Mg 0.20 Zn 0.02 ) Σ5.94 P 6.02 O 24 (H 2 O) 2, ideally NaCa 2 M (1) Mn 2 M (2) [Fe 3+ Fe +2 ] M (3) Mn 2 (PO 4 ) 6 (H 2 O) 2 . The Gladstone-Dale relation gives a compatibility index of 1 – ( K P / K C ) = 0.010 (superior). This new member of the wicksite group is Mn-rich, and, like...
FIGURES
Journal Article
Published: 01 February 2012
Mineralogical Magazine (2012) 76 (1): 37–44.
... for the wavelength 590 nm using a gel filter, are α = 1.904, γ = 2.030, and these values are in accord with the mean refractive index, 1.988, calculated from the Gladstone-Dale relation. Natrotitanite is monoclinic, C 2/ c , a = 6.5691(2), b = 8.6869(3), c = 7.0924(2) Å, β = 114.1269(4)°, V = 369.4(2) Å 3 , Z = 4...
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Journal Article
Published: 01 September 1991
The Canadian Mineralogist (1991) 29 (3): 525–532.
Journal Article
Published: 01 April 1962
American Mineralogist (1962) 47 (3-4_Part_1): 267–290.
... satisfactorily to the Gladstone-Dale, NewtonDrude, and Allen equations. The relation between refractive index and density for this series is non-linear in contrast to what is commonly thought. For solutional series in general, refractive index and density are linearly related only if ( ∂ ρ ∂ n ) c = ( ∂ ρ ∂ n...
Journal Article
Published: 01 October 2014
Mineralogical Magazine (2014) 78 (5): 1325–1340.
... estimated as 1.96 from the Gladstone-Dale relationship. It is pleochroic O (bluish green) >> E (nearly colourless). Electron microprobe analyses gave the empirical formula Cu 5.82 I 0.99 Al 0.02 Si 0.12 O 3.11 (OH) 9.80 Cl 1.09 based on 14 (O+Cl) a.p.f.u. The Raman spectrum shows strong iodate-related...
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Journal Article
Published: 01 October 2007
The Canadian Mineralogist (2007) 45 (5): 1307–1324.
..., molybdates, tungstates, germanates, iodates, nitrates, oxalates, antimonites, antimonates, sulfites, halides, and borates. The mineral species in the Fair, Poor and Incomplete categories in these groups require further study. Abstract La relation de GladstoneDale permet de dériver un indice de...
Journal Article
Published: 01 June 2004
The Canadian Mineralogist (2004) 42 (3): 781–785.
... 3.88 Nb 0.06 ) ∑3.94 Si 8.01 O 28 ·4H 2 O ou, en termes plus simples, Na 6 MnTi 4 Si 8 O 28 ·4H 2 O. La densité calculée (à partir de la formule empirique) est 2.88 g/cm3, et la densité mesurée est 2.86(1) g/cm 3 . L’indice de compatibilité selon la loi de Gladstone et Dale est 0.038 (excellent...
FIGURES
Journal Article
Published: 01 September 2016
American Mineralogist (2016) 101 (9): 2108–2117.
... to OH ( Fig. 6 ), and thus vránaite is formulated as an anhydrous mineral. Figure 6 Raman spectrum of vránaite compared to spectra of boralsilite and muscovite. The Gladstone-Dale relation ( Mandarino 1981 ) gives a compatibility index 1 − ( K P / K C ) = 0.001 (superior). Novák et...
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Journal Article
Published: 01 October 2016
American Mineralogist (2016) 101 (10): 2288–2300.
... the chemical composition and the polarizabilities of ions determined here. The calculated mean values of < n D > for 54 common minerals and 650 minerals and synthetic compounds differ by <2% from the observed values. In a comparison of polarizability analysis with 68 Gladstone-Dale compatibility index...
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Journal Article
Published: 01 April 2005
The Canadian Mineralogist (2005) 43 (2): 543–552.
... be consistent with the composition indicated by the structural formula, thus constraining the valence of ions and the state of order. index of refraction polarized light optical mineralogy photon GladstoneDale relation mineral composition garnet Most analytical methods do not include provision...
FIGURES
Journal Article
Published: 01 January 2019
European Journal of Mineralogy (2019) 31 (1): 145–152.
...-yellow to white streak, translucent to transparent, and with adamantine luster. Mohs hardness is 3½–4, and the tenacity is brittle. It has perfect {100}, {001}, and {010} cleavages, and the calculated density is 6.903 g/cm 3 . The mineral is biaxial positive with 2 V = 70°. The GladstoneDale...
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Journal Article
Published: 01 January 2015
European Journal of Mineralogy (2015) 27 (1): 113–122.
... is transparent with strong vitreous lustre, it is isotropic, n =1.672(1) (589 nm). The microhardness VHN load 50 g is 632(37) kg mm −2 , corresponding to 5–5½ hardness according to the Mohs scale; the calculated density is 2.941 g cm −3 . The calculated Gladstone-Dale’s compatibility factor 1–(K p /K c )=−0.016...
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Journal Article
Published: 01 April 2014
American Mineralogist (2014) 99 (4): 607–611.
... powder data indexed by analogy with related laueite-group minerals (space group: P 1̄) are: a = 5.383(2), b = 10.363(3), c = 6.878(2) Å, α = 96.42(4), β = 109.19(3), γ = 102.30(2)°, V = 347.1(2) Å 3 , and Z = 1. Gladstone-Dale compatibility is −0.020 (excellent). Césarferreiraite is the arsenate analog...
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Journal Article
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1206–1212.
... could not be measured, but the average index calculated from the Gladstone-Dale relationship is 1.849. The empirical formula based on Pb + Sr + Ca = 2 atoms per formula unit (apfu), 1 H apfu and B + Si = 5 apfu, is (Pb 1.967 Sr 0.026 Ca 0.007 ) ∑2.000 (B 4.983 Si 0.017 ) ∑5.000 (Cl 1.073 I 0.004...
FIGURES
Journal Article
Published: 01 April 2011
Mineralogical Magazine (2011) 75 (2): 269–278.
... , respectively; the average RI is n = 1.57; the Gladstone-Dale compatibility is −0.050 (good). Electron microprobe analysis gives (wt.%): CaO 0.96, MgO 0.12, MnO 14.29, FeO 0.60, ZnO 0.24, Al 2 O 3 22.84, P 2 O 5 31.62, F 5.13 and H 2 O 22.86 (by CHN), less F=O 2.16, total 96.50. The corresponding empirical...
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Journal Article
Published: 01 October 2010
American Mineralogist (2010) 95 (10): 1554–1559.
... and perfect {100} cleavage. The calculated density is 8.496 g/cm 3 based on the empirical formula. Markcooperite is biaxial (+), with indices of refraction α = 2.11, β = 2.12, γ = 2.29 calculated using the Gladstone-Dale relationship, measured α-β birefringence of 0.01 and measured 2 V of 30(5)°. The optical...
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Journal Article
Published: 01 March 2010
European Journal of Mineralogy (2010) 22 (2): 309–316.
... pleochroic (yellowish brown with a reddish tint to reddish brown), with no observable dispersion. A mean refractive index of 2.23 was calculated from the Gladstone-Dale relationship using the X-ray density. Heftetjernite is named after its type locality. The mineral is compared with synthetic ScTaO 4 , ScNbO...
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Journal Article
Published: 01 October 2007
American Mineralogist (2007) 92 (10): 1630–1639.
... 3 (from X-ray structure refinement). The new mineral is biaxial with very weak pleochroism from yellow to pale yellow; the refractive indices measured on the (021) cleavage face range from n min = 1.657 to n max = 1.660; the Gladstone-Dale relationship provides a value of 1.65. The empirical...
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Journal Article
Published: 01 February 1962
American Mineralogist (1962) 47 (1-2): 90–104.
... O 4 , probably close or equal to MgO·Al 2 O 3 ·4SiO 2 as deduced from the phase assemblages. On the other hand, the measured mean index of refraction (1.535), according to the Gladstone-Dale relationship, suggests a composition containing less SiO 2 such as 4MgO·4Al 2 O 3 ·7SiO 2 . The other...
Journal Article
Published: 01 October 1956
American Mineralogist (1956) 41 (9-10): 757–777.
...Howard W. Jafff Abstract The relation, ( n— 1)/ d = K , the rule of Gladstone and Dale, holds very well for crystalline substances based upon data for 121 minerals selected from modern literature. The specific refractive energy values of the constituents of minerals, determined by Larsen, need very...