File:Olivine melilitite lapillistone (Hegau Volcanic Province, Late Miocene, 10 Ma; Howenegg, Rhine Graben, southwestern Germany) 2 (15004267712).jpg
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Olivine_melilitite_lapillistone_(Hegau_Volcanic_Province,_Late_Miocene,_10_Ma;_Howenegg,_Rhine_Graben,_southwestern_Germany)_2_(15004267712).jpg (768 × 576 pixels, file size: 618 KB, MIME type: image/jpeg)
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Summary
| Description |
Olivine melilitite lapillistone (field of view 1.8 cm across) with grains of olivine melilitite (gray & brown) cemented together by calcite (yellow). The lapilli grains (= gray & brown chunks) are composed of porphyritic olivine melilitite. This is one of the strangest & visually distinctive volcanic rocks I’ve come across. This is an olivine melilitite lapillistone. This means it is a clastic-textured, extrusive igneous rock dominated by grains larger than ash (>2 mm in size). Grains of this size are called lapilli. A lapillistone (lapilli tuff) is a deposit of lapilli that’s been lithified - in this case, the grains have been cemented together by calcite. The lapilli in this sample range in shape from subrounded to angular. There's quite a few <2 mm grains in the rock as well. The lapilli grains themselves are composed of an unusual igneous rock called porphyritic olivine melilitite, which consists of a mix of olivine, diopside pyroxene, and melilite (calcium sodium magnesium aluminosilicate - (Ca,Na)2(Al,Mg)(Si,Al)2O7). Locality & Geology: Howenegg, Hegau Volcanic Province, Rhine Graben, southwestern Germany. Age: early Late Miocene, 10 m.y. |
| Date | |
| Source | Olivine melilitite lapillistone (Hegau Volcanic Province, Late Miocene, 10 Ma; Howenegg, Rhine Graben, southwestern Germany) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15004267712 (archive). It was reviewed on 4 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:40, 4 November 2019 | | 768 × 576 (618 KB) | Ainz Ooal Gown | Transferred from Flickr via #flickr2commons |
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