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Petr Hykš

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fossils

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11 Questions

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votes

answer

views

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

May 14 at 0:11 Ryan 1

votes

answer

226

views

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

meteorology lightning storms thunderstorm

Apr 27 '17 at 4:11 Knob Scratcher 2,016

votes

answer

491

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.heydebreck 2,476

votes

answers

363

views

Muscovite with pleochroic halos?

geology mineralogy minerals

Aug 29 '19 at 9:15 Community♦ 1

votes

answers

views

How does quartz form in calcite veins?

geology mineralogy minerals

Dec 31 '16 at 1:00 Gordon Stanger 13.8k

votes

answer

358

views

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

fossils paleontology

Aug 29 '19 at 16:36 Community♦ 1

votes

answer

187

views

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

geology sedimentology petrology paleontology

Feb 6 '17 at 13:00 Jan Doggen 2,554

votes

answers

900

views

Could this be pyroxene twinning ? (thin section)

mineralogy

Dec 6 '16 at 18:32 Petr Hykš 595

votes

answers

549

views

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

geology mineralogy

Nov 24 '16 at 1:18 Daniel Griscom 1,128

vote

answers

109

views

Pileus / velum & altocumulus / altostratus - classification problems

meteorology atmosphere clouds troposphere

Aug 4 '17 at 22:23 Petr Hykš 595

votes

answer

138

views

What exactly is ammonite?

fossils

Dec 1 '19 at 20:19 Glorfindel 479

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11 Questions

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

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

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

Muscovite with pleochroic halos?

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)

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

Pileus / velum & altocumulus / altostratus - classification problems

What exactly is ammonite?