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Any idea what this is?


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I can’t really see the crystals in this too well. In some spots they look like dogtooth calcite. In other spots they look like quartz. I think what you’ve got there is a coating of calcite crystals on weathered limestone, but I’m not certain enough to say for sure.

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15 minutes ago, d_day said:

I can’t really see the crystals in this too well. In some spots they look like dogtooth calcite. In other spots they look like quartz. I think what you’ve got there is a coating of calcite crystals on weathered limestone, but I’m not certain enough to say for sure.

Put a few drops of warm vinegar on the crystals. If it starts to bubble after a few minutes, it's calcite.

Do same with the matrix. If it bubbles, it's limestone.

No bubbling...it's most likely quartz.

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