TEM characterisation and interpretation of fabric and structural degree of order in microcrystalline SiO2 phases |
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| Authors: | C Wahl G Miehe H Fuess |
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| Institution: | TechnischeUniversit?t Darmstadt, Fachbereich Material- und Geowissenschaften, Petersenstr. 23, 64827 Darmstadt, Germany,
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| Abstract: | Representative samples of the two fabric varieties of microcrystalline quartz, chalcedony and quartzine, from agates of different origin were investigated by transmission electron microscopy (TEM). Both varieties contain lamellar admixtures of the SiO2 mineral moganite. The transitions from quartz to moganite within the fabric differ in a characteristic way. Whereas in quartzine the gradient between the structures is steep, the transition is more continuous in chalcedony. The morphology of moganite in chalcedony and quartzine is determined by the (101)-face; in pure moganite from Gran Canaria it is governed by the (110)-face. |
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