Buchite, Porcellanite

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Other keyboard shortcuts:

1Fit image to screen
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<Make background darker
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Controls - Animation (Spin Rotation)

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Summary of all keyboard shortcuts

1Fit image to screen
2Fill screen with image
3Switch to 3D display of stereo pair
4Switch left/right images in 3D mode
5Display at full resolution
<, >Make background darker/lighter
H or ?Show/hide this help page
PPlay/Pause Video or Animation
[, ]Backwards/forwards one frame (Animation only)
up arrowShow information box
down arrowHide information box
left arrowPrevious image/media page
right arrowNext image/media page
spaceHide/dim titles and buttons

Copyright © Łukasz Kruszewski 2019
minID: YFF-1XJ

Buchite, Porcellanite

Copyright © Łukasz Kruszewski 2019  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 8 mm

This is a thin section (normal light, binocular photo) of a composite pyrometamorphic formation sometimes called pyrometamorphic breccia. Most of the section is multi-color, very characteristic buchite with clearly seen vesicular texture. The white rock is porcellanite. The buchite is mainly composed of mullite, a spinel phase (yellow-orange zones: most likely so-called silicon spinel or gamma-Al2O3 phase ; green zones: hercynite-rich phase), relic ("resistate") quartz, and small amounts of anorthite, tridymite (an example of monoclinic polytypes), and unconfirmed traces of nepheline and forsteritic olivine. The porcellanite is more rich in mullite and bears some cristobalite, quartz, and possible traces of anorthite and corundum. This particular sample needs a confirmation due to the simultaneous occurrence of artificial "rocks" in the heap, namely oven slags. However, the latter artificial "rocks" are quite easily distinguished from the natural ones formed in the heap by a macroscopic examination.

This photo has been shown 83 times
Photo added:8th Apr 2019
Dimensions:1277x1024px (1.31 megapixels)
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