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Petr Hykš

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fossils

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11 Questions

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135

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What exactly is ammonite?

fossils

Dec 1 '19 at 20:19 Glorfindel 417

vote

answers

108

views

Pileus / velum & altocumulus / altostratus - classification problems

Aug 4 '17 at 22:23 Petr Hykš 615

votes

answer

478

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 2,466

votes

answer

225

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 1,986

votes

answer

182

views

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

geology sedimentology petrology paleontology

Feb 6 '17 at 13:00 Jan Doggen 2,534

votes

answer

views

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

geology geochemistry mineralogy crystallography

May 14 at 0:11 Ryan 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

355

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

answers

878

views

Could this be pyroxene twinning ? (thin section)

mineralogy

Dec 6 '16 at 18:32 Petr Hykš 615

votes

answers

355

views

Muscovite with pleochroic halos?

geology mineralogy minerals

Aug 29 '19 at 9:15 Community♦ 1

votes

answers

541

views

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

geology mineralogy

Nov 24 '16 at 1:18 Daniel Griscom 1,118

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11 Questions

What exactly is ammonite?

Pileus / velum & altocumulus / altostratus - classification problems

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

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

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

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?

Could this be pyroxene twinning ? (thin section)

Muscovite with pleochroic halos?

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