Wikipedia picture of the day

Audio/video playlist featuring Wikipedia picture of the day. Each video is 1 minute or less. These videos are Licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

Sunday, August 13, 2023

I made a video about a rock.

This is a rock called Biotite granite. It is a medium-grained, all crystalline rock with pink feldspar, gray quartz, and specks of black biotite - a type of mica found in igneous and metamorphic rocks.

Biotite mica is a composition of annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, eastonite, and many others.

Biotite is a rock-forming mineral found in a wide range of crystalline igneous rocks such as granite, diorite, gabbro, peridotite, and pegmatite.

Biotite has limited commercial use but may be as a filler in paints and drilling mud or as a non-stick coating on shingles.

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