Rockhounder's club (on topic)

[UnionStrong]

I knew what I was in for when I posted this thread.

I found this glossy, dark brown, piece of what I think is sard in a freshly regraveled road.

View attachment 391033

Haters can suck it!

Nice

 

[zubenelgenubi]

Looks like flint

My area isn't known for flint. This is translucent, as you can see where there is a chip, it is diffusing the light, whereas flint is opaque. Flint, chert, jasper and chalcedony (sard is just brown chalcedony) are all variations of quartz, or silicon dioxide, to be precise. If this is chalcedony, it would also cause iron to throw sparks like flint does, due to the hardness of the material.

 

[UnionStrong]

My area isn't known for flint. This is translucent, as you can see where there is a chip, it is diffusing the light, whereas flint is opaque. Flint, chert, jasper and chalcedony (sard is just brown chalcedony) are all variations of quartz, or silicon dioxide, to be precise. If this is chalcedony, it would also cause iron to throw sparks like flint does, due to the hardness of the material.

Cool looking. I have to admit, I’ve collected a few rocks and fossils my self.

 

[oldngray]

My area isn't known for flint. This is translucent, as you can see where there is a chip, it is diffusing the light, whereas flint is opaque. Flint, chert, jasper and chalcedony (sard is just brown chalcedony) are all variations of quartz, or silicon dioxide, to be precise. If this is chalcedony, it would also cause iron to throw sparks like flint does, due to the hardness of the material.

There are some really good flint outcroppings near me and they don't look like that.

 

[zubenelgenubi]

There are some really good flint outcroppings near me and they don't look like that.

The flint I've seen looks like a gray jasper. Though I'm pretty sure it can cone in other colors and I believe it forms more like chert.

 

[oldngray]

The flint I've seen looks like a gray jasper. Though I'm pretty sure it can cone in other colors and I believe it forms more like chert.

It looks different if it has been exposed to the air and elements. A lot more brittle too. Its better to dig out a fresher piece.

Most of it looks like this around here

But they do have some colors if you polish them

 

[UnionStrong]

It looks different if it has been exposed to the air and elements. A lot more brittle too. Its better to dig out a fresher piece.

Most of it looks like this around here

View attachment 391043

But they do have some colors if you polish them


View attachment 391044

Like agate.

 

[zubenelgenubi]

Like agate.

Agate is a lapidary term to refer to mostly banded chalcedony. Whenever I talk about it I call it all agate, though, it's just easier to say, and most people don't know what chalcedony is.

 

[542thruNthru]

Found this one on the beach. Looked it up. I believe the scientific name is....

Gumbyist GrillMeatus.

 

[over9five]

Found this one on the beach. Looked it up. I believe the scientific name is....

Gumbyist GrillMeatus.
View attachment 391065

Juheesis....