<p>Most likely some form of chalcedony, not knowing where you found it, I'd call it flint, a form of chert. </p>

CC BY-SA 4.0
2019-09-05T19:02:58.623Z
2019-09-05T19:02:58.623Z
BurnTheWitch
<p>It is 9 1/2 inches by 3 1/2 inches and weighs about 5 lbs. it was at this house in Florida when we bought it. It has a white 1/4 inch crust and the interior color looks somewhat topaz. <img src="https://i.sstatic.net/kUhhm.jpg" alt="enter image description here"></p>

CC BY-SA 4.0
2019-09-05T19:23:59.143Z
It looks like a large flint nodule. Flint nodules occur in limestone, especially chalk limestone. Flint is a very common mineral, and therefore has no value unless it has been fashioned into  a tool  by ancient hominids. Chemically it is silicon dioxide, similar to quartz.. Voids in the limestone became filled by silicon-laden micro-currents which precipitated their  silicon dioxide content when passing through one of these voids. Flint occasionally contains small fossils
Michael Walsby
CC BY-SA 4.0
2019-09-05T20:19:37.140Z
@MichaelWalsby why didn't you add this as an answer?
Jossie Calderon
CC BY-SA 4.0
2019-09-05T20:27:18.737Z
Because rock ID questions are usually  put on hold. I'm surprised this one hasn't been, but I expect it soon will  be.
Michael Walsby
<geology>
Could someone tell me what this stone might be
Phyllis
# Could someone tell me what this stone might be

(Asked by: username_0 on 2019-09-05)

It is 9 1/2 inches by 3 1/2 inches and weighs about 5 lbs. it was at this house in Florida when we bought it. It has a white 1/4 inch crust and the interior color looks somewhat topaz. ![enter image description here](https://i.sstatic.net/kUhhm.jpg)

**Tags:** geology

> **Comments:**
> **username_1**: It looks like a large flint nodule. Flint nodules occur in limestone, especially chalk limestone. Flint is a very common mineral, and therefore has no value unless it has been fashioned into  a tool  by ancient hominids. Chemically it is silicon dioxide, similar to quartz.. Voids in the limestone became filled by silicon-laden micro-currents which precipitated their  silicon dioxide content when passing through one of these voids. Flint occasionally contains small fossils  
> **username_2**: @username_1 why didn't you add this as an answer?  
> **username_1**: Because rock ID questions are usually  put on hold. I'm surprised this one hasn't been, but I expect it soon will  be.  

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## 1 answers

### Answer by username_3 on 2019-09-05. Score: 2

Most likely some form of chalcedony, not knowing where you found it, I'd call it flint, a form of chert.


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