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1-20 OF 95 RESULTS FOR
pleochroism
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Journal Article
Mn 3+ and the pink color of gem-quality euclase from northeast Brazil
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 March 2022
American Mineralogist (2022) 107 (3): 489–494.
...Lætitia Gilles-Guéry; Laurence Galoisy; Jurgen Schnellrath; Benoit Baptiste; Georges Calas Abstract Pink euclase of gem quality and centimeter size, presenting an unusual pink-orange coloration and a pink to orange pleochroism, was discovered near Livramento de Nossa Senhora, in Bahia State, Brazil...
Journal Article
Elasmochloite, Na 3 Cu 6 BiO 4 (SO 4 ) 5 , a new fumarolic mineral from the Tolbachik volcano, Kamchatka, Russia
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 September 2019
European Journal of Mineralogy (2019) 31 (5-6): 1025–1032.
.... It is transparent, green, with vitreous lustre. The calculated density ( D calc ) is 3.844 g cm −3 . Elasmochloite is optically uniaxial or pseudo-unixial (−), α = 1.611(2), β = γ = 1.698(2), 2 V ≈ 0°. Pleochroism is strong, Z ≈ Y (grass-green) > X (turquoise-blue). The chemical composition obtained by electron...
Includes: Supplemental Content
Journal Article
Fe-rich antigorite: a rock-forming mineral from low-temperature/high-pressure meta-ophicarbonates
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 July 2019
European Journal of Mineralogy (2019) 31 (4): 775–784.
... microscopy (TEM), and its mineral chemistry has been investigated by means of wavelength-dispersive and TEM-based energy-dispersive spectrometry. In thin section, Fe-rich antigorite is characterized by a strong, peculiar pleochroism (α = green–dark green; γ = bright-yellow–orange). It occurs in both mesh...
Includes: Supplemental Content
Journal Article
Ferrirockbridgeite, ( Fe 0.67 3 + □ 0.33 ) 2 (Fe 3+ ) 3 (PO 4 ) 3 (OH) 4 (H 2 O), and the oxidation mechanism for rockbridgeite-group minerals
Ian Edward Grey, Anthony R. Kampf, Erich Keck, John D. Cashion, Colin M. MacRae, Yesim Gozukara, Finlay L. Shanks
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 585–594.
... > v . The optical orientation is X = c , Y = a , Z = b . The pleochroism is X = yellow brown, Y = olive brown, Z = dark olive green; Z > Y > X . Crystal structure refinements on ferrirockbridgeite and other oxidized rockbridgeite-group species, including type rockbridgeite and type frondelite...
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Journal Article
The rockbridgeite group approved and a new member, ferrorockbridgeite, (Fe 2+ ,Mn 2+ ) 2 (Fe 3+ ) 3 (PO 4 ) 3 (OH) 4 (H 2 O), described from the Hagendorf Süd pegmatite, Oberpfalz, Bavaria
Ian E. Grey, Anthony R. Kampf, Erich Keck, John D. Cashion, Colin M. MacRae, Yesim Gozukara, Vanessa K. Peterson, Finlay L. Shanks
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 March 2019
European Journal of Mineralogy (2019) 31 (2): 389–397.
... = 1.781(calc), γ = 1.797(3) (white light) and 2 V (meas.) = 87(1)° from extinction data. The optical orientation is X = c , Y = a , Z = b . The pleochroism is X = blue green, Y = olive green, Z = yellow brown; X ≈ Y > Z . Corresponding author, e-mail: Ian.grey@csiro.au 21 08 2018 17 10...
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Journal Article
Jahnsite-(MnMnZn), a new jahnsite-group mineral, and formal approval of the jahnsite group
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 January 2019
European Journal of Mineralogy (2019) 31 (1): 167–172.
... cleavage parallel to {001} and Mohs’ hardness of about 4. The measured density is 2.89(2) g cm −3 . Optically, it is biaxial (+), with α = 1.655(2), β = 1.662(2), γ = 1.673(2) (white light); 2 V = 78(1)°; pleochroism: X nearly colourless, Y and Z beige; X < Y ≈ Z . Electron microprobe analyses gave...
Journal Article
Manganflurlite, Zn Mn 3 2 + Fe 3+ (PO 4 ) 3 (OH) 2 (H 2 O) 7 ·2H 2 O, a new schoonerite-related mineral from the Hagendorf-Süd pegmatite
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 January 2019
European Journal of Mineralogy (2019) 31 (1): 127–134.
..., the mineral dissolves rapidly in dilute HCl. Optically, manganflurlite is biaxial (–), with α = 1.623(calc), β = 1.649(2), γ = 1.673(2) (white light); 2 V = 86(1)°. The dispersion is r > v , slight; the optical orientation is X = c , Y = b , Z = a . The pleochroism is X = pale yellow brown, Y = orange...
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Journal Article
Tantalowodginite, (Mn 0.5 □ 0.5 )TaTa 2 O 8 , a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A.
Sarah L. Hanson, Alexander U. Falster, William B “Skip” Simmons, Raymond Sprague, Pietro Vignola, Nicola Rotiroti, Sergio Andó, Frédéric Hatert
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 23 October 2018
The Canadian Mineralogist (2018) 56 (4): 543–553.
... (+) and has a 2 V angle of ≅ 70° with strong dispersion. It exhibits weak to moderate pleochroism: orangish-yellow parallel to cleavage and greenish-yellow perpendicular to cleavage on (010). The measured Z ∧ c is 5–12°. The birefringence is strong to extreme; interference colors are very high-order tints...
Journal Article
Meitnerite, (NH 4 )(UO 2 )(SO 4 )(OH)·2H 2 O, a new uranyl-sulfate mineral with a sheet structure
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 September 2018
European Journal of Mineralogy (2018) 30 (5): 999–1006.
..., meitnerite is biaxial (–), with α = 1.568(2), β = 1.589(2), γ = 1.607(2) (white light); 2 V = 84(1)°. The dispersion is r > v , moderate, The optical orientation is X ∧ b = 26°, Y ∧ a = 15°, Z ∧ c = 53°. The pleochroism is X nearly colourless, Z pale green yellow, Y light green yellow; X < Z < Y...
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Journal Article
Pararaisaite, the Dimorph of Raisaite, from the North Star Mine, Tintic, Utah, Usa
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 September 2018
The Canadian Mineralogist (2018) 56 (5): 811–820.
...: perfect on {001} and good on {100}. The measured density is 2.85(2) g/cm 3 . Pararaisaite is biaxial (+) with α = 1.600(2), β = 1.616(2), γ = 1.713(3) (white light); 2 V = 47(1)°; slight r > v dispersion; orientation Z = b , X ≈ a , Y ≈ c ; and pleochroism X very pale purple, Y purple, Z blue green ( X...
Journal Article
Lavinskyite-1 M , K(LiCu)Cu 6 (Si 4 O 11 ) 2 (OH) 4 , the monoclinic MDO equivalent of lavinskyite-2 O (formerly lavinskyite), from the Cerchiara manganese mine, Liguria, Italy
Uwe Kolitsch, Stefano Merlino, Donato Belmonte, Cristina Carbone, Roberto Cabella, Gabriella Lucchetti, Marco E. Ciriotti
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 811–820.
... is ∼5. The calculated density is 3.613 g/cm 3 (for empirical formula). Optically, it is biaxial positive, with α = 1.674(2); β = 1.692(3) and γ = 1.730(3); 2 V γ is very large, ∼75° (est.), 2 V γ (calc.) = 70°. Pleochroism is moderate: X (pale) blue, Y pale blue and Z pale blue with faint greenish tint...
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Journal Article
Ferriperbøeite-(Ce), [CaCe 3 ] ∑=4 [Fe 3+ Al 2 Fe 2+ ] ∑=4 [Si 2 O 7 ][SiO 4 ] 3 O(OH) 2 , a new member of the polysomatic epidote–törnebohmite series from the Nya Bastnäs Fe-Cu-REE deposit, Sweden
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 May 2018
European Journal of Mineralogy (2018) 30 (3): 537–544.
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Journal Article
Greenlizardite, (NH 4 )Na(UO 2 ) 2 (SO 4 ) 2 (OH) 2 ·4H 2 O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA
Journal: Mineralogical Magazine
Published: 01 April 2018
Mineralogical Magazine (2018) 82 (2): 401–411.
...°. Dispersion is moderate, r < v . Pleochroism is X = very pale yellow green, Y = pale yellow green and Z = light yellow green; X < Y < Z . The optical orientation is X ≈ c , Y ≈ a and Z ≈ b* . The Raman spectrum exhibits bands attributable to both sulfate and uranyl groups. Electron probe...
Journal Article
Bytízite, a new Cu-Sb selenide from Příbram, Czech Republic
Journal: Mineralogical Magazine
Published: 01 February 2018
Mineralogical Magazine (2018) 82 (1): 199–209.
... density is 6.324 g cm –3 . In reflected light bytízite is grey with a yellowish hue, yellowish and brownish. Bireflectance and pleochroism are weak. Anisotropy is strong with grey to brownish rotation tints. Internal reflections were not observed. The empirical formula, based on electron-microprobe...
Journal Article
Protoenstatite: A new mineral in Oregon sunstones with “watermelon” colors
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 October 2017
American Mineralogist (2017) 102 (10): 2146–2149.
... color in red core and green board are microplates of native Cu. Figure 2. Transmitted light photomicrographs of a polished sunstone crystal (~5 mm thickness) from the green border part show pleochroism (light brown to pale green). The cleavage plane (001) is perpendicular to the light. Some...
Journal Article
Brodtkorbite, Cu 2 HgSe 2 , from Příbram, Czech Republic: crystal structure and description
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 August 2017
European Journal of Mineralogy (2017) 29 (4): 663–672.
Journal Article
How to facet gem-quality chrysoberyl: Clues from the relationship between color and pleochroism, with spectroscopic analysis and colorimetric parameters
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 August 2017
American Mineralogist (2017) 102 (8): 1747–1758.
...Ziyin Sun; Aaron C. Palke; Jonathan Muyal; Robison Mcmurtry Abstract Pleochroism plays an important role in determining the face-up visual color appearance of faceted, optically anisotropic (non-cubic) gemstones. One area that has received little attention is the interplay between pleochroism...
Journal Article
Infrared spectroscopic study of OH defects in monazite
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 26 June 2017
European Journal of Mineralogy (2017) 29 (6): 949–957.
... and ∼3335 cm −1 with contrasting bandwidths of ∼40 and ∼90 cm −1 , respectively. The two OH bands show strong pleochroism and dominant infrared absorption in the Y direction. The IR spectra of natural monazite contain a weak pleochroic OH band centred around 3400 cm −1 with a bandwidth of more than 200 cm...
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Journal Article
Juansilvaite, Na 5 Al 3 [AsO 3 (OH)] 4 [AsO 2 (OH) 2 ] 2 (SO 4 ) 2 ·4H 2 O, a new arsenate-sulfate from the Torrecillas mine, Iquique Province, Chile
Journal: Mineralogical Magazine
Published: 01 June 2017
Mineralogical Magazine (2017) 81 (3): 619–628.
..., juansilvaite is biaxial (+) with α = 1.575(1), β = 1.597(1), γ = 1.623(1) and 2V = 86(1)° (measured in white light). Dispersion is r < v , slight, and the orientation is X = b ; Z ^ c = 27° in the obtuse angle β. The pleochroism is X > Y ≈ Z in shades of pale pink. The mineral is slowly soluble in dilute...
Journal Article
Cyprine, Ca 19 Cu 2+ (Al,Mg,Mn) 12 Si 18 O 69 (OH) 9 , a new vesuvianite-group mineral from the Wessels mine, South Africa
Taras L. Panikorovskii, Vladimir V. Shilovskikh, Evgenia Yu. Avdontseva, Andrey A. Zolotarev, Igor V. Pekov, Sergey N. Britvin, Ulf Hålenius, Sergey V. Krivovichev
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 May 2017
European Journal of Mineralogy (2017) 29 (2): 295–306.
... with a lilac hue and vitreous lustre. Dominant crystal forms are {1 0 0}, {1 1 0} and {3 3 1}. The Mohs hardness is 6.5. D meas and D calc are 3.40(3) and 3.41 g/cm 3 , respectively. Cyprine is optically uniaxial, negative, ω = 1.744(2), ε= 1.732(2) (in white light). Pleochroism is strong; ranging from O...
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