Publication Date:
1973-12-01
Description:
An unusual chlorite has been collected from amygdales in Miocene volcanic rock found at Taiheizan, Akita Prefecture, Japan. The mineral shows subtle variations from other chlorites and related minerals. These are: (a) no apparent expansion with water or ethylene glycol, (b) negligible or no collapse after NH4-saturation or heating at about 300°C, (c) a slow decrease in the basal spacing on heating from approximately 400°C to 760°C, (d) a small amount of low temperature or capillary water and (e) a DTA curve with a vermiculite-like system of peaks.The mineral is identified as a highly chloritic vermiculite with a small proportion of imperfect hydroxy interlayer.
Print ISSN:
0009-8558
Electronic ISSN:
1471-8030
Topics:
Geosciences
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