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Petr Hykš

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phylogeny

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11 Questions

Views Newest Activity Votes

votes

answer

179

views

What is the best way to stay safe while photographing lightning storms?

Apr 27 '17 at 4:11 Knob Scratcher 1,827

votes

answer

391

views

What “g” would be needed to keep helium on Earth?

geophysics geochemistry planetary-science atmospheric-chemistry gas

Dec 13 '17 at 9:42 daniel.neumann 2,232

votes

answer

views

What is the white coating “patina” we often see on deposited chalcedony/agate?

geology geochemistry mineralogy crystallography

Feb 11 '17 at 5:28 MaxW 481

votes

answers

views

How does quartz form in calcite veins?

geology mineralogy minerals

Dec 31 '16 at 1:00 Gordon Stanger 13.3k

votes

answer

284

views

I have found this fossil tooth, could it be pliosaur ? Or maybe theropod?

identification-request paleontology

Jun 22 '18 at 3:33 Stephanie Lucas 11

votes

answer

146

views

Do you have any informations about fossil-rich cherts from Scandinavia?

geology sedimentology petrology paleontology

Feb 6 '17 at 13:00 Jan Doggen 1,834

votes

answers

561

views

Could this be pyroxene twinning ? (thin section)

mineralogy

Dec 6 '16 at 18:32 Petr Hykš 315

votes

answers

260

views

Muscovite with pleochroic halos?

geology identification-request mineralogy

Dec 6 '16 at 6:16 Gimelist 16.4k

votes

answers

394

views

I have found this structure in thin section. What is it?

geology mineralogy

Nov 24 '16 at 1:18 Daniel Griscom 887

vote

answers

views

Pileus / velum & altocumulus / altostratus - classification problems

meteorology atmosphere clouds troposphere

Aug 4 '17 at 22:23 Petr Hykš 315

-1

votes

answer

views

What exactly is ammonite?

ammonite ammonoid phylogeny sutures ammonitic

May 12 at 11:14 Petr Hykš 315

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11 Questions

What is the best way to stay safe while photographing lightning storms?

What “g” would be needed to keep helium on Earth?

What is the white coating “patina” we often see on deposited chalcedony/agate?

How does quartz form in calcite veins?

I have found this fossil tooth, could it be pliosaur ? Or maybe theropod?

Do you have any informations about fossil-rich cherts from Scandinavia?

Could this be pyroxene twinning ? (thin section)

Muscovite with pleochroic halos?

I have found this structure in thin section. What is it?

Pileus / velum & altocumulus / altostratus - classification problems

What exactly is ammonite?