id help

[phantom35]

 

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[EricTheCat]

The first one looks like it might be chert or agate. Just a wild guess. Were the first two tumbled/polished?

If you can tell us where they were found (roughly) and the hardness of these it might help someone to be able to identify these. I am not that good at identification myself but someone else may be able to help with that information.

Good luck,
Eric

 

[Moesia]

First and second are polished conglomerate and are a stretch to guess to what the parent rock is on such a small specimen. Third is chalcedony. Fourth is serpentinite. Fifth look's like hydrothermally altered rock close to no 3 and 4? Are you near some ophiolite?

 

[Eu_citzen]

#3 Looks like either K Feldspar or Calcite. Hardness test with knife. If scratched: Calcite.

 

[Moesia]

#3 No

 

[Eu_citzen]

Please, elaborate, Moesia.

#3 clearly has cleavage, as can be seen if you zoom in on the photo. It's reddish, which makes those two the most likely candidates.

 

[phantom35]

l have 2-3 kg calcite, 3. pic not calcite

 

[Moesia]

Do you know the geology of the area, where are the rocks from if you do not know the geology. I can guess to what you aim at...

 

[Moesia]

Apologies, i was in a hurry. It has no cleavage it is simply broken on a flat surface. As it has no conchoidal cleavage it is safe to assume it is chalcedony, opal would show conchoidal to uneven fracture. The rock is clearly silica rich, you can even make out a small quartz geoid in the bottom left corner of the picture.

 

[Eu_citzen]

Apologies, i was in a hurry. It has no cleavage it is simply broken on a flat surface. As it has no conchoidal cleavage it is safe to assume it is chalcedony, opal would show conchoidal to uneven fracture. The rock is clearly silica rich, you can even make out a small quartz geoid in the bottom left corner of the picture.

I assume we might be counting the numbers in a different order?
Middle row, to the left. It definitely has cleavage.

As a side note: Chalcedony does also show conchoidal fracture (not cleavage!).

 

[phantom35]

other pics number 3 rock

 

[Brian T. Booth]

I assume we might be counting the numbers in a different order?
Middle row, to the left. It definitely has cleavage.

As a side note: Chalcedony does also show conchoidal fracture (not cleavage!).

#3 calcite. Agreed with EU

 

[phantom35]

lol

 

[Neon]

Im pretty sure that's a feldspar crystal in that calcite.