r/askgeology

Massive 20kg rock and about a foot wide. From South West UK. Does not fizz when I put vinegar on it and absolutely will not scratch with a knife.

We were in a dry creek bed near the Warner Mountains at around 5600 ft elevation. There was a lot of obsidian and petrified wood in the area. My nine year old son found it and I'd like to be able to tell him what he found. Thanks in advance for any help.

I am at the very south of Sri Lanka near Thangalle, and I noticed this incredible line of mineral? Running down the middle of the rocks all the way down the beach. Could anyone kindly shed some light on this? Was it a flat layer formed over thousands of millions of years and fell over so all I can see now is a line? How did it from? What is it? I have 0 knowledge of geology, just find this line running down the whole beach to be incredibly fascinating. Would totally watch a whole docco if one existed.

Found in river in northeast Washington state.

I have collected several rocks from this location, but I have never found anything close to this. It appears to be small yellow or amber colored nodules inside of this matrix.

The matrix is very hard. It appears porous, but it does almost like a quartz.

No idea what I found. Does anybody have a clue?

It almost looks like a clutch of fossilized eggs, but I’m sure it’s nodules of some type.

Any help would be appreciated!

Would it be silly for me to suspect an impact related cause? Looks intensely and chaotically deformed. Photo #2 looks almost pseudotachylitic (maybe?), though it's kind of hard to make out as I just pulled this from a creek where it seems to have recently fallen off the sidewall.

Will post dry pics in comments asap.

The formation reminds me of sand dunes, but they seem much more rigid. Anyone have any idea how they're formed?

The shape is botryoidal, the colour is brownish...but it's not limonite, I think it's quartz that has taken this beautiful shape .

What causes holes like theses they all have straight clean edges in found this rock in the garden.

In some marine terrace deposits with shell fragments. Curious if it’s some precipitate from mud cracks or some animals tubes pretty extensive and concrete-like

Why is this little area blue and what is it?

This is a screen shot of some drone footage I saw on a an off-roading YouTube channel. The mountain is somewhere in the Canadian Rockies in BC.

I don’t know much about Geology, but this rock “wave” doesn’t fit with my understanding of how the Rockies were formed. Instead of a range of hard rock getting pushed up where two plates meet, this rock looks like warm taffy.

Can anyone give me some more information? I’d look it up, but I don’t know the name of the mountain or even exactly where it is in BC.

They are either purple or pink and found in Hvalfjörður, Iceland. They are called baggalútur (I think) in Icelandic but I dont know the english word for it. Really curious to know how they form.

I'm trying to get rid of some old crystals of mine but I'm having a hard time identifying this. I bought it at a metaphysical shop but I have no clue what it might be. I don't have anything to test how hard it is but it has a waxy sort of luster

Found in southern Ontario, Niagara Region in late 80s

magnetic

8" by 5" by 5" (approx)

weight 30 lbs 2oz