The detailed information about the samples, preparation and main results can be examined here. All pictures from Matzka (1997).
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Spherules consisting of magnetite and hematite (bright). Note that some spherules consist of Fe-oxide crystals embedded in glassy matrix, whereas others consist mostly of Fe-oxides. (~ 150 x 250 µm) {RL optical, oil immersion}. | ASH1
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Spherules consisting of magnetite and hematite (bright). The biggest spherule is ~ 70 µm in diameter {RL optical, oil immersion}. | ASH1 |
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Spherules consisting of magnetite and hematite (bright). The biggest spherule is ~ 60 µm in diameter {RL optical, oil immersion}. | ASH1 |
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Several spherules consisting of hematite (bright) and magnetite (covered by brownish ferrofluid). The biggest spherule is ~ 50 µm in diameter {RL optical, oil immersion}. | ASH1 |
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Iron oxide spherule with structured surface, and small satellite Fe-oxide spheres magnetically attached {SEM, BSE}. | ASH1 |
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Spherule with iron oxides forming triangles and hexagons on its surface, which are visible due to the larger backscatter intensity from the Fe-rich areas {SEM, BSE}. | ASH2 |
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Plerosphere (larger sphere with internal baby spheres) with dendritic iron oxides in a Fe-Si glassy matrix {SEM, BSE}. | ASH1 |
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Internal structure of spherules with brain-like (or cuneiform-like) structured intergrowth of Fe-oxide crystals {SEM, BSE}. | ASH1 |
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Cruciform iron oxides on the surface of a silicate glass spherule- an expressiion of the internally organised growth of Fe-oxide dendrites within the sphere {SEM, BSE}. | ASH1 |
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blocky-textured Fe-oxide crystals in spherule, cross section {SEM, BSE}. | ASH1 |
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Cruciform iron oxides within a silicate glass spherule, cross section {SEM, BSE}. | ASH1 |
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Part of a sphere, containing holes within the slicate glass and dendritic Fe-oxides (brighter), cross section {SEM, BSE}. | ASH1 |
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Spherule with structured surface- typical for Fe-rich spherules {SEM, **photo 7325). | ASH2 |
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Spherule, the smooth part of the surface contains no Fe, the structured part contains Fe {SEM}. | ASH2 |
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general view of spherules with size up to 10 µm diameter {SEM}. | ASH1 |
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Spherule consisting of intergrowth of Fe-oxide crystals {SEM, BSE}. | ASH2 |