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Calcined Colemanite

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Taken with Canon Canon PowerShot SX260 HS

  • 14.6 mm
  • 1/100
  • f f/4.5
  • ISO 400
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Pieter:

When I have chemically etched materials they separate out into carbons, solids, and metals. I would agree soluble salts are clinging to the sides: but by chance are those carbons floating? I do not know what the LOI of colemanite is off the top of my head, or how high you calcined this material.

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I stuck the Colemanite in a bisque firing to 915 C, which should be around cone 09. Theoretically, Colemanite has an LOI of 21.9%, but I've seen an analysis of 23.7%. I don't have the exact % weight loss of the sample I used in front of me, but I think it was just over 24%, so I doubt there's much carbon left, if any.

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