Mineralienatlas - Fossilienatlas
Bilder (9 Bilder gesamt)
Aufrufe (File: ): 288
Polished axial section of a merelaniite Reflected light microscope images of a polished axial section of a merelaniite whisker (0.09 mm diameter) (Nikon Optiphot-Pol petrographic microscope): (a) polarizer and analyzer both aligned horizontally; (b) crossed polarizers; and (c) slightly un-crossed polarizers. (A. E. Seaman Mineral Museum collection DM 31323, reference 3666cr2). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480438054 Wertung: 10 (Stimmen: 1) Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Polished axial section of a merelaniite |
Reflected light microscope images of a polished axial section of a merelaniite whisker (0.09 mm diameter) (Nikon Optiphot-Pol petrographic microscope): (a) polarizer and analyzer both aligned horiz... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 257
Polished merelaniite whisker Reflected light microscope images of longitudinal sections of a polished merelaniite whisker (0.06 mm diameter) (Nikon Optiphot-Pol petrographic microscope): (a) Polarizer and analyzer both aligned vertically, parallel to the whisker axis; (b) Polarizer and analyzer both aligned vertically, perpendicular to the whisker axis; (c,d) Analyzer aligned vertically and polarizer slightly plus/minus un-crossed. It is not certain if the core of the whisker reflects more brightly due to a possible chemical difference between the core and outer region or is simply because the layers in the core are parallel to the polished surface. (A. E. Seaman Mineral Museum collection DM 31324, reference 3666ax2). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480437974 Wertung: 10 (Stimmen: 1) Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Polished merelaniite whisker |
Reflected light microscope images of longitudinal sections of a polished merelaniite whisker (0.06 mm diameter) (Nikon Optiphot-Pol petrographic microscope): (a) Polarizer and analyzer both aligned... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 245
Merelaniit SEM (Hitachi S-4700) images of merelaniite (Smithsonian Institution specimen NMNH 177015, reference 3323). (a) Merelaniite cylinder partially exposed from enclosing calcite; (b) Close-up image of the surface showing visible growth-layer steps; (c,d) The same merelaniite whisker after being broken, showing the curved lamellar (scroll) structure. John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480437878 Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Merelaniit |
SEM (Hitachi S-4700) images of merelaniite (Smithsonian Institution specimen NMNH 177015, reference 3323). (a) Merelaniite cylinder partially exposed from enclosing calcite; (b) Close-up image of t... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 286
Merelaniit Scanning electron microscope (SEM) images of samples taken from the holotype specimen. (a) Cluster of merelaniite whiskers with one notably larger cylinder, associated with graphite. (Sample 3666i-190i.); (b) Section of a merelaniite-graphite cluster showing well-formed graphite crystals (Sample 3666i-190h.); (c,d) Merelaniite whiskers showing partially un-wound layers. (Sample 3666-196a.); (e,f) Individual whiskers showing conical ends and undulating diameters (Samples 3666i 190d and 3666 196c). Images taken using a Hitachi S-4700 field-emission SEM (Hitachi, Tokyo, Japan). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480437807 Wertung: 10 (Stimmen: 1) Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Merelaniit |
Scanning electron microscope (SEM) images of samples taken from the holotype specimen. (a) Cluster of merelaniite whiskers with one notably larger cylinder, associated with graphite. (Sample 3666i-... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 637
Merelaniite whiskers Scanning electron microscope (SEM) images of samples taken from the holotype specimen. (a) Cluster of merelaniite whiskers with one notably larger cylinder, associated with graphite. (Sample 3666i-190i.); (b) Section of a merelaniite-graphite cluster showing well-formed graphite crystals (Sample 3666i-190h.); (c,d) Merelaniite whiskers showing partially un-wound layers. (Sample 3666-196a.); (e,f) Individual whiskers showing conical ends and undulating diameters (Samples 3666i 190d and 3666 196c). Images taken using a Hitachi S-4700 field-emission SEM (Hitachi, Tokyo, Japan). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480437673 Wertung: 9.5 (Stimmen: 2) Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Merelaniite whiskers |
Scanning electron microscope (SEM) images of samples taken from the holotype specimen. (a) Cluster of merelaniite whiskers with one notably larger cylinder, associated with graphite. (Sample 3666i-... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 432
Quartz crystal with inclusions of merelaniite Optical photographs of (a) 2.8-cm-tall quartz crystal with inclusions of merelaniite whiskers, also associated with chabazite crystals; (b) close-up of (a) showing merelaniite, graphite and an unidentified fan-shaped phase at the left of the image (~8 mm wide field-of-view). (A. E. Seaman Mineral Museum collection DM 31315; ex. Simon Harrison collection.). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480437563 Wertung: 10 (Stimmen: 1) Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Quartz crystal with inclusions of merelaniite |
Optical photographs of (a) 2.8-cm-tall quartz crystal with inclusions of merelaniite whiskers, also associated with chabazite crystals; (b) close-up of (a) showing merelaniite, graphite and an unid... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 1101
Merelaniite Optical photographs of merelaniite and some associated minerals: (a) 0.73-mm-long “cylindrical” whisker of merelaniite associated with tremolite, prehnite, and chabazite (private collection); (b) Whisker of merelaniite (0.9-mm section), associated with calcite, showing undulating diameters (Simon Harrison collection; sample 3941); (c) 2.5-mm section of a 5-mm-long merelaniite whisker (maximum diameter 0.18 mm) showing naturally unraveled ribbons, some partially enclosed in calcite, and associated with yellow prehnite (Simon Harrison collection; sample 3941); John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480437438 Wertung: 10 (Stimmen: 2) Lizenz: Creative Commons - Namensnennung (CC-BY) V.3.0 |
Merelaniite |
Optical photographs of merelaniite and some associated minerals: (a) 0.73-mm-long “cylindrical” whisker of merelaniite associated with tremolite, prehnite, and chabazite (private collection); (b) W... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 739
Merelaniite, Stilbite, Graphite, Alabandite Whiskers of merelaniite, some showing an oscillatory variation in diameter, partly overgrown by stilbite crystals associated with small but very sharp graphite crystals. This was in a crevice in an 11-cm long crystal group of alabandite, and is part of the holotpe specimen of merelaniite. Locality: Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania; [http://www.mdpi.com/2075-163X/6/4/115] Copyright: John A. Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1480436152 Wertung: 10 (Stimmen: 1) Lizenz: Nur zur Mineralienatlas-Projekt-Verwendung |
Merelaniite, Stilbite, Graphite, Alabandite |
Whiskers of merelaniite, some showing an oscillatory variation in diameter, partly overgrown by stilbite crystals associated with small but very sharp graphite crystals. This was in a crevice in an... |
Copyright: | John A. Jaszczak |
Beitrag: Stefan 2016-11-29 |
Mehr | MF |
Aufrufe (File: ): 1523
Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite Cylindrical whisker (0.73 mm long) of merelaniite associated with tremolite, and prehnite (not shown also include graphite, calcite, and chabazite). Locality: Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania; Copyright: John Jaszczak; Beitrag: Stefan Fundort: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani) Mineral: Merelaniit Bild: 1477698403 Wertung: 10 (Stimmen: 2) Lizenz: Nur zur Mineralienatlas-Projekt-Verwendung |
Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite |
Cylindrical whisker (0.73 mm long) of merelaniite associated with tremolite, and prehnite (not shown also include graphite, calcite, and chabazite). Locality: Merelani Hills, Lelatema Mts, Simanjir... |
Copyright: | John Jaszczak |
Beitrag: Stefan 2016-10-28 |
Mehr | MF |