File:Agate-filled geode (Brazil) 2 (32714553426).jpg

Original file (1,552 × 1,432 pixels, file size: 649 KB, MIME type: image/jpeg)

Summary

Description

Agate from Brazil. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA)

"Agate" is a rockhound/collector term for irregularly- & concentrically-layered masses of microcrystalline quartz. Individual layers consist of translucent or opaque, microcrystalline, fibrous quartz called chalcedony. Impurities in different layers cause variations in color. Many agate masses are simply geodes that have completely filled up with quartz. Common agate colors are clearish-whitish-grayish, brownish-red, and yellowish-brown. Commercial agates that occur in greens and blues and purples are almost always dyed (faked).

The whitish, glassy material at the center of this specimen is macrocrystalline quartz.
Date
Source Agate-filled geode (Brazil) 2
Author James St. John

Licensing

w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32714553426 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 October 2019

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

30 January 2011

image/jpeg

009c460f61f56c500dbd152a15449d83f5213f98

664,299 byte

1,432 pixel

1,552 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current07:12, 10 October 2019Thumbnail for version as of 07:12, 10 October 20191,552 × 1,432 (649 KB)Ser Amantio di NicolaoTransferred from Flickr via #flickr2commons

The following 2 pages use this file:

Global file usage

The following other wikis use this file:

Metadata