Happy holidays to everyone 🦋. Pentagonite (Xmas tree habit), Wagholi quarry, Pune, Maharashtra, India. #MineralMonday #RocksInTrees

Wider view of the same location. The crystals formed from sublimation are considerably different in habit from the more familiar blocky crystals of Sicily or Maybee, Michigan, US or Conil, Spain. While relatively common as an element, its high reactivity makes native sulfur fairly rare.

Literally crystallizing from thin air! Sulphur crystals forming at a volcanic vent, Sulphur Banks trail, Volcano National Park, Hawaii, United States. #MineralMonday #Geology

It's fresh and flowing directly toward me. The finger at the bottom is only feet away when I took the photo and was inching closer. The surface is cooler and pliable. The feel when applying pressure is reminiscent of bread dough. (2/3)

Smooth flowing lava over only slightly older pahoehoe. Notice that both are still glowing. Pu‘u ‘Ō‘ō eruption, north of Chain of Craters Road, Volcano National Park, Hawaii, United States. (1/3)

Petroglyphs carved into ‘Desert Varnish’, Valley of Fire State Park, Clark County, Nevada, United States. (1/3)

Classic example of cross-bedding from Zion-Mount Carmel highway, Zion National Park, Utah, United States. In essence, these are fossil sand dunes. #geology