EISCO Oolitic Limestone, Sedimentary Rock Specimen - Approx. 1" - Geologist Selected & Hand Processed - Great for Science Classrooms

It is exactly what the title and description say. Pieces of limestone. We got about 6 small pieces in our bag. I did not purchase these for the classroom or any kind of specimen showcase. I actually purchased them for some of my isopods that are naturally found in limestone caves. The limestone is decent quality and is definitely limestone.

If your kid is doing a science fair project about sink holes, acidity, or erosion, these work well. Not all the same size though, there was a difference of about 20g from smallest to largest.

I love demonstrating for students how acid dissolves limestone. It felt like a lot of money for six little pieces of limestone (to someone who used to live where every streambed was full of limestone pebbles!) -- but each stone can be used more than once, as there's no need to let it sit in the vinegar until it disappears, so there's that.I still want to ask a friend in Indiana to just send me a bag of rocks for the price of postage.

The rock quality and size was exactly what I expected. I am pleased with the purchase.

I used these for an experiment, but they came in such small pieces. They looked a bit broken and had lots of dust and pieces in the pack when they arrived.

Limestone rock in chunks is hard to find! These specimen rocks were the perfect size for what my church needed for science experiments during Vacation Bible School. I could've used many more for our experiments but at this price I could only afford two packs for 24 one time use rocks.

The media could not be loaded. I received this item as described. I added a couple to my tank and it seems to have helped naturally adjust the pH levels. I have a small tank and used two in it.

The oolites in my sample weren't very distinct. But delivered promptly in good shape.