#gelogy

[tff-praefectus]

Mosasaur tooth

[earthstory]

lukas.schlagenhauf

Milky Way time lapse at Haggenegg.

The last piece of my Haggenegg-trilogy. For this video, I used the astro-time lapse-mode of my new star tracker (tracked stars, restart at origin position) which worked quite well. Unfortunately, the stacking softwares had quite a hard time to stack the images for the previous uploaded picture. Lesson learned...

[jvstinderosa]

Enchanted Falls

[earthstory]

Arsendescloizite with Mimetite

The deep green crust is a rare lead/zinc arsenate mineral, born in a complex series of processes. It started life as a gushing deep sea volcanic vent near a spreading ridge where new oceanic crust is being born, charged with metals that precipitated out as sulphides in the black smokers we all know and love. After the volcanic heat and hydrothermal convection cell died down, the newly minted ore deposit was subject to the vagaries of geological history such as continental collisions, tectonic uplift and subsidence and the like, eventually ending up on land. As the rocks above were eroded away, oxygenated water percolated down from the surface, altering the primary minerals into a variety of secondary ones. Both the minerals here are secondary (we have already covered mimetite, the whitish yellow sprigs on the green crust at http://on.fb.me/1zo1vvI). The colour of arsendescloizite ranges from light yellow to dark green, and the mineral is quite soft, with a Mohs hardness of 4. It was only named fairly recently, in the early 80's. The type locality from which it was first described is the Tsumeb mine in Namibia, which we recently covered athttp://on.fb.me/1c2CjkD. The specimen in the photo was mined at the Ojuela Mine in Mexico and measures 11.0 x 6.3 x 5.0 cm.

Loz Image credit: Rob Lavinsky/iRocks.com

http://bit.ly/1DSbxS2 http://bit.ly/1DSb02A http://www.mindat.org/min-356.html

[earthstory]

Reindeer Island Astronaut Chris Hadfield took this photo of Reindeer Island a few years ago when he was on the International Space Station. Reindeer Island is, a tiny and undeveloped island in the middle of Canada’s lake Winnipeg, one of the remnants of the larger Glacial Lake Agassiz that covered much of Central Canada as the ice sheets were melting 10,000 years ago. -JBB Image credit: Chris Hadfield https://tmblr.co/ZpMfPt2TEiJd0

[wewetkes]

so, uhhh

anyone got obsidian to spare?

[biology-geology-beaches-india]

Cliff-face on Yarada Beach,Visakhapatnam, India, May 26, 2019.

[chaehbae]

New on 500px : The majestic Heilhornet by Aziz_Nasuti by Aziz_Nasuti Heilhornet (1058 m) or Heil horns are a marked landmark in southwest Bindal Municipality, Nordland. The mountain is the second highest mountain in the municipality, after Tjeldviktinden on the border with Brønnøysunds and have prominence in 1055 meters.