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You may be thinking of "Dune Roller" (1951) by Julian May. Here is a page containing some information about the story, as well as links to various radio and video adaptations. As noted by @user14111, the story was published in the December 1951 issue of Astounding Science Fiction, which may be viewed at the Internet Archive.

The story is set in a remote town on the shore of Lake Michigan. Here's a synopsis as I recall it:

The story opens sometime in prehistory, when a meteor appears and explodes over the lake. A fish eats one of the fragments and dies.

The story proper introduces a scientist who is studying the local wildlife. While inspecting an inlet he finds a strange, bright-colored, smooth stone with a little pointy section like a tail. Later, some kids find a dead frog and bring it to him. He autopsies the frog and finds it died from internal injuries. He also finds another of these stones in its stomach. The scientist bribes the kids to find more stones, and he eventually ends up with half a dozen samples.

The scientist visits a friend who works at a glass factory. The friend thinks the stones might be something like a Prince Rupert's drop. While hammering on one of his samples (as one might do with a Prince Rupert's drop), he discovers that the stone can emit great amounts of heat.

Other strange things are happening in the community. I think some residents are found burned to death, with strange tracks leading into the water.

As the story progresses, the scientist figures out that the stones can move by rolling around, and they can coalesce into larger stones. One of the locals was seemingly killed by a stone the size of an ostrich egg.

The scientist develops the theory that there's a bigger stone out there somewhere. In the climax, the scientist sets a dynamite trap on the beach and uses his samples to draw in the large stone. A truly massive Dune Roller appears out of the water and ends up being blown to bits.

In an epilogue, the story describes two little grains of sand on the beach, which seem to glow slightly, and then merge together. The cycle begins again...

You may be thinking of "Dune Roller" (1951) by Julian May. Here is a page containing some information about the story, as well as links to various radio and video adaptations. As noted by @user14111, the story was published in the December 1951 issue of Astounding Science Fiction, which may be viewed at the Internet Archive.

The story is set in a remote town on the shore of Lake Michigan. Here's a synopsis as I recall it:

The story opens sometime in prehistory, when a meteor appears and explodes over the lake. A fish eats one of the fragments and dies.

The story proper introduces a scientist who is studying the local wildlife. While inspecting an inlet he finds a strange, bright-colored, smooth stone with a little pointy section like a tail. Later, some kids find a dead frog and bring it to him. He autopsies the frog and finds it died from internal injuries. He also finds another of these stones in its stomach. The scientist bribes the kids to find more stones, and he eventually ends up with half a dozen samples.

The scientist visits a friend who works at a glass factory. The friend thinks the stones might be something like a Prince Rupert's drop. While hammering on one of his samples (as one might do with a Prince Rupert's drop), he discovers that the stone can emit great amounts of heat.

Other strange things are happening in the community. I think some residents are found burned to death, with strange tracks leading into the water.

As the story progresses, the scientist figures out that the stones can move by rolling around, and they can coalesce into larger stones. One of the locals was seemingly killed by a stone the size of an ostrich egg.

The scientist develops the theory that there's a bigger stone out there somewhere. In the climax, the scientist sets a dynamite trap on the beach and uses his samples to draw in the large stone. A truly massive Dune Roller appears out of the water and ends up being blown to bits.

In an epilogue, the story describes two little grains of sand on the beach, which seem to glow slightly, and then merge together. The cycle begins again...

You may be thinking of "Dune Roller" (1951) by Julian May. Here is a page containing some information about the story, as well as links to various radio and video adaptations. The story can also be accessed here, but only the first few pages are available for free.

The story is set in a remote town on the shore of Lake Michigan. Here's a synopsis as I recall it:

The story opens sometime in prehistory, when a meteor appears and explodes over the lake. A fish eats one of the fragments and dies.

The story proper introduces a scientist who is studying the local wildlife. While inspecting an inlet he finds a strange, bright-colored, smooth stone with a little pointy section like a tail. Later, some kids find a dead frog and bring it to him. He autopsies the frog and finds it died from internal injuries. He also finds another of these stones in its stomach. The scientist bribes the kids to find more stones, and he eventually ends up with half a dozen samples.

The scientist visits a friend who works at a glass factory. The friend thinks the stones might be something like a Prince Rupert's drop. While hammering on one of his samples (as one might do with a Prince Rupert's drop), he discovers that the stone can emit great amounts of heat.

Other strange things are happening in the community. I think some residents are found burned to death, with strange tracks leading into the water.

As the story progresses, the scientist figures out that the stones can move by rolling around, and they can coalesce into larger stones. One of the locals was seemingly killed by a stone the size of an ostrich egg.

The scientist develops the theory that there's a bigger stone out there somewhere. In the climax, the scientist sets a dynamite trap on the beach and uses his samples to draw in the large stone. A truly massive Dune Roller appears out of the water and ends up being blown to bits.

In an epilogue, the story describes two little grains of sand on the beach, which seem to glow slightly, and then merge together. The cycle begins again...

You may be thinking of "Dune Roller" (1951) by Julian May. Here is a page containing some information about the story, as well as links to various radio and video adaptations. As noted by @user14111, the story was published in the December 1951 issue of Astounding Science Fiction, which may be viewed at the Internet Archive.

The story is set in a remote town on the shore of Lake Michigan. Here's a synopsis as I recall it:

The story opens sometime in prehistory, when a meteor appears and explodes over the lake. A fish eats one of the fragments and dies.

The story proper introduces a scientist who is studying the local wildlife. While inspecting an inlet he finds a strange, bright-colored, smooth stone with a little pointy section like a tail. Later, some kids find a dead frog and bring it to him. He autopsies the frog and finds it died from internal injuries. He also finds another of these stones in its stomach. The scientist bribes the kids to find more stones, and he eventually ends up with half a dozen samples.

The scientist visits a friend who works at a glass factory. The friend thinks the stones might be something like a Prince Rupert's drop. While hammering on one of his samples (as one might do with a Prince Rupert's drop), he discovers that the stone can emit great amounts of heat.

Other strange things are happening in the community. I think some residents are found burned to death, with strange tracks leading into the water.

As the story progresses, the scientist figures out that the stones can move by rolling around, and they can coalesce into larger stones. One of the locals was seemingly killed by a stone the size of an ostrich egg.

The scientist develops the theory that there's a bigger stone out there somewhere. In the climax, the scientist sets a dynamite trap on the beach and uses his samples to draw in the large stone. A truly massive Dune Roller appears out of the water and ends up being blown to bits.

In an epilogue, the story describes two little grains of sand on the beach, which seem to glow slightly, and then merge together. The cycle begins again...

You may be thinking of "Dune Roller" (1951) by Julian May. I wasn't able to find a copy of the story text online, but here is a page containing some information about the story, as well as links to various radio and video adaptations.

The story is set in a remote, seaside or lakeside town. Here's a synopsis as I recall it:

The story opens sometime in prehistory, when a meteor appears and explodes over the lake. A fish or something eats one of the fragments and dies.

The story proper introduces a scientist who is studying the local wildlife. Some kids find a dead frog and bring it to him. He autopsies the frog and finds it died from internal burns. He finds a strange, smooth stone inside which seems to glow slightly. The scientist bribes the kids to find more stones, and he eventually ends up with half a dozen samples.

At some point, the scientist visits a friend who works at a glass factory. The friend thinks the stones might be something like a Prince Rupert's drop. While hammering on a stone sample (as one might do with a Prince Rupert's drop), he discovers that the stone can emit great amounts of heat.

Other strange things are happening in the community. I think some residents are found burned to death, with strange tracks leading into the water.

As the story progresses, the scientist figures out that the stones can coalesce into larger stones, and that a big stone is out there somewhere.

In the climax, the scientist sets a dynamite trap on the beach and uses his samples to draw in the large stone. A truly massive Dune Roller appears out of the water and ends up being blown to bits.

In an epilogue, the story describes two little grains of sand on the beach, which seem to glow slightly, and then merge together. And the cycle begins again...

You may be thinking of "Dune Roller" (1951) by Julian May. Here is a page containing some information about the story, as well as links to various radio and video adaptations. The story can also be accessed here, but only the first few pages are available for free.

The story is set in a remote town on the shore of Lake Michigan. Here's a synopsis as I recall it:

The story opens sometime in prehistory, when a meteor appears and explodes over the lake. A fish eats one of the fragments and dies.

The story proper introduces a scientist who is studying the local wildlife. While inspecting an inlet he finds a strange, bright-colored, smooth stone with a little pointy section like a tail. Later, some kids find a dead frog and bring it to him. He autopsies the frog and finds it died from internal injuries. He also finds another of these stones in its stomach. The scientist bribes the kids to find more stones, and he eventually ends up with half a dozen samples.

The scientist visits a friend who works at a glass factory. The friend thinks the stones might be something like a Prince Rupert's drop. While hammering on one of his samples (as one might do with a Prince Rupert's drop), he discovers that the stone can emit great amounts of heat.

Other strange things are happening in the community. I think some residents are found burned to death, with strange tracks leading into the water.

As the story progresses, the scientist figures out that the stones can move by rolling around, and they can coalesce into larger stones. One of the locals was seemingly killed by a stone the size of an ostrich egg.

The scientist develops the theory that there's a bigger stone out there somewhere. In the climax, the scientist sets a dynamite trap on the beach and uses his samples to draw in the large stone. A truly massive Dune Roller appears out of the water and ends up being blown to bits.

In an epilogue, the story describes two little grains of sand on the beach, which seem to glow slightly, and then merge together. The cycle begins again...