#43ap Wikipedia picture of the day on March 25, 2020: Scanned…

#43ap Wikipedia picture of the day on March 25, 2020:
Scanned image of thin section from Siilinjärvi apatite ore in cross polarised transmitted light. Actual sector size about 37 × 20 mm.
Thin section scan crossed polarizers Siilinjärvi R636-105.90 edit.jpg.

from WordPress https://vladislavkarelin.wordpress.com/2020/03/25/43ap-wikipedia-picture-of-the-day-on-march-25-2020-scanned/


https://66.media.tumblr.com/03d449efa6e7bc9c2c98cd5b380920c2/9781c35fd4fa6aec-70/s500x750/f738bc10cbe66bb10eb3665c09569cec778edc04.jpg