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Summary
DescriptionIceblue-all2 hg.jpg |
English: Chalcedony ice-blue, origin: West-Greenland between Ivittuut and Disko Bay, rubble from glacial moraine, polished section and ring
Deutsch: Chalcedon ice blue, Herkunft: West-Grönland zwischen Ivittuut und Disko Bucht, Geschiebe aus einer Moraine, polierter Schnitt und Ring
In Grönland ist weißer bis gräulicher Chalcedon aus vulkanischen Schichten des Paläozän bekannt, im Gebiet Disko-Nuussuaq in Westgrönland und aus dem Gebiet des Scoresby Sund. Aus Illorsuit ist eine hellblaue Chalcedon-Variante bekannt, die in den vulkanischen Gesteinen entlang der Südküste der Insel entstanden ist. Wegen seiner bläulichen, eisähnlichen Farbe hat es den lokalen Namen Chalcedon Ice-blue. In Nordwestgrönland tritt Calcedon als tennisballgroße Hohlraumfüllungen in vulkanischem Gestein aus der prähistorischen Periode der Erde (älter als 600 Millionen Jahre) auf. Eine sehr charakteristische Calcedon-Variante sind die so genannten "chert pebbles", die an vielen Stellen im östlichen Teil von Disko gesammelt werden können (Larsen & Pedersen, 1990). Sie ähneln in vielerlei Hinsicht der Struktur des Feuersteins, haben aber eine gelbliche bis bräunliche Färbung. Quelle: GEUS Martin Ghisler & Secher (2020) Smykkesten fra Grønland i GEUS' prøvesamlinger (Gemstones from Greenland in the sample collections of the Geological Survey of Denmark and Greenland) Danmarks og Grønlands Geologiske Untersøgelse Rapport 2020/50 https://www.geus.dk/Media/637588304356429792/Smykkestensrapport_GEUS2021.pdf |
Date | |
Source | Own work |
Author | Hannes Grobe |
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135 millimetre
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:21, 19 June 2022 | ![]() | 4,928 × 2,808 (2.49 MB) | Hgrobe | Uploaded own work with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON Df |
Exposure time | 1/2 sec (0.5) |
F-number | f/22 |
ISO speed rating | 100 |
Date and time of data generation | 20:22, 20 May 2022 |
Lens focal length | 135 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS6 (Macintosh) |
File change date and time | 18:50, 10 June 2022 |
Exposure Program | Aperture priority |
Exif version | 2.21 |
Date and time of digitizing | 20:22, 20 May 2022 |
Shutter speed | 1 |
APEX aperture | 8.918863 |
Exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTimeOriginal subseconds | 8 |
Color space | sRGB |
Focal plane X resolution | 1,368.888885498 |
Focal plane Y resolution | 1,368.888885498 |
Focal plane resolution unit | 3 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 135 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 6005891 |
Lens used | 28.0-300.0 mm f/3.5-5.6 |
Rating (out of 5) | 0 |
Date metadata was last modified | 20:50, 10 June 2022 |
Unique ID of original document | 477F7C167F1A73811439A995476C9D7A |