EISCO 12PK Oolitic Limestone, Sedimentary Rock Specimens - Approx. 1" - Geologist Selected & Hand Processed - Great for Science Classrooms - Class Pack

We used these limestone rocks for my son’s science fair project. We were testing the effects of acid rain/pollutants on dissolving rocks. And these rocks were perfect for it! Fairly similar in size so we could measure and weight to keep track of the variable for the project. I can see how they could be used for other purposes too. They were nice and shiny. Very good quality.

I purchased this to enhance my triops' aquarium, and they've been fantastic! The hand-processed quality and unique oolithic texture make them visually appealing and a great addition to the habitat. The rocks are the perfect size for small tanks, and my Triops enjoy exploring them while it also helps maintain the pH of the water. Highly recommended for aquarium enthusiasts and educators!

These pieces are small, which is what I was looking for for my isopods. These are great value as long as you know that beforehand though!

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.

Used these for raising the Ph in my fish tank. Seems to be working!

My daughter purchased these rocks for a science experiment. She was sure that soda would discolor them if they were left submerged overnight. They did not discolor at all. So we now have a few special rocks on are backyard and she has a few less dollars in her piggy bank. Why did you pick this product vs others?:

my isopods love this stuff, excellent for limestone needing species like magic potions.

Put in aquarium and fish still seem healthy