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➥ Merelaniite

Bilder (9 Bilder gesamt)

Polished axial section of a merelaniite
Aufrufe (File:
1480438054
): 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 
Polished merelaniite whisker
Aufrufe (File:
1480437974
): 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 
Merelaniit
Aufrufe (File:
1480437878
): 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 
Merelaniit
Aufrufe (File:
1480437807
): 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 
Merelaniite whiskers
Aufrufe (File:
1480437673
): 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 
Quartz crystal with inclusions of merelaniite
Aufrufe (File:
1480437563
): 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 
Merelaniite
Aufrufe (File:
1480437438
): 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 
Merelaniite, Stilbite, Graphite, Alabandite
Aufrufe (File:
1480436152
): 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 
Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite
Aufrufe (File:
1477698403
): 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