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Lime stone sand in cob?

 
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Location: Shenandoah Valley
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Any thoughts on using lime stone sand in cob? The gentleman at the quarry said it has a higher refractory temperature than silica based sands.

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Hmmm...refractory being higher than silica...that raises questions.

Dolomitic limestone may have a hire quartz, silicate and chert content but to call it "refractory" would be pushing it. I don't believe any limestone species has a higher refractory capacity than silicates especially albumin silicate. I would ask more questions.

As for its use as an additive to cobb...I see no issue at all.
 
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