Epidote, an abundant rock-forming mineral found in metamorphic rocks, nearly always appears in green, although it may vary in shade and tone. Under a microscope of polarized light, however, it exhibits strong pleochroism, that is, it shows different colors when observed at different angles. The thin section (a laboratory preparation of a mineral or rock sample for use with a polarizing microscope) ...[Read More]
Seismic Spring, part 3: All systems go – at work on Storglaciären!
As the Arctic wakes up from its polar night, Dr Adam Booth is leading a team of UK geophysicists on a two-week campaign of seismic investigations on Storglaciären, a mountain glacier in northern Sweden. He will be reporting on the expedition in a series of posts published here in GeoLog. This is his third post. If you haven’t already done so, be sure to check out his first and second po ...[Read More]
Imaggeo on Mondays: Green river
Thermokarsts occur when solid permafrost melts and soil gives way forming pitted, irregular lands surfaces. They are common in the Arctic, as well as the Himalayas and Swiss Alps. To study them, scientists trace the water using fluorescence dyes, temporarily creating water flows of exotic colours, like the bright green one in this Imaggeo photo. This photo was taken by Simon Gascoin, a researcher ...[Read More]
Seismic Spring, part 2: Planes, trains and snowmobiles
As the Arctic wakes up from its polar night, Dr Adam Booth is leading a team of UK geophysicists on a two-week campaign of seismic investigations on Storglaciären, a mountain glacier in northern Sweden. He is reporting on the expedition in a series of posts published here in GeoLog. This is his second post, and the first from the research station itself. Check out the first post here. Hello, from ...[Read More]