Volcanic litharenite, Conaripe, Chile
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Foamy obsidian, glass bead is 200μ |
Location:
Conaripe, Lago Calafquen, South Chile; low energetic beach of a former glacier lake
Provenance:
Volcanic lava
Composition:
Green and black obsidian, with embedded clinopyroxene and plagioclase; andesitic mikrolithes, ignimbrit; PRF's: plagioclase, ortho-/clinopyroxene (Gabbro); monocrystalline quartz; SRF: Aragonit (Ooid)
Petrographic thin section:
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Bright field |
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Dark Field |
Texture:
Immature, poorly sorted, poorly rounded (angular), light grey to black, hyaline and dull surfaces, middle to coarse sand (250 to 1250 μm)
Sample number |
Collector |
Date of sampling |
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heubeck0097 |
Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
January 2005 |
Comments:
Composition is similar to Black Sand Beach (Hawaii), but with less obsidian and additonal PRF's
