Hematite : Fe2O3, Tripuhyite : Fe3+Sb5+O4, Chert

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Other keyboard shortcuts:

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Controls - 3D Stereoscopic images

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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 © Norman King
minID: AHD-Y86

Hematite : Fe2O3, Tripuhyite : Fe3+Sb5+O4, Chert

Field of View: 1.4 mm

Weathered chert containing tabular, hexagonal crystals of two types: 1, metallic gray (red arrow) and 2, earthy orange (blue arrow). The metallic gray crystal was tested using EDS (see daughter photo), and shown to be hematite. That crystal, and several others seen here, are coated by reddish-brown, translucent material that resembles tripuhyite, identified by EDS in several other samples. The earthy orange crystals are opaque. The latter may also be hematite, and are awaiting analysis. These crystals all have the same habit as graphite and pyrite/marcasite crystals in other samples, and all of these are apparently pseudomorphs after graphite, with some having gone through two replacement episodes where graphite was first replaced by pyrite/marcasite, which was then oxidized to hematite during weathering. Tripuhyite formed where there was adequate antimony in solution, derived from weathering of stibnite and parapierrotite. The field shown here was rotated to have same orientation as the back-scatter image on the EDS report, with white strip added at top for full visibility of orange crystal when enlarged. Daughter photos show the EDS report and view of the hand specimen. Sample collected by Phil Richardson in the late 1980's. Photography and sample preparation by Norman King. EDS by John Attard.

This photo has been shown 114 times
Photo added:6th Jan 2016
Dimensions:1812x1815px (3.29 megapixels)

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