Volcanic Ash 2
Description: From Ron Roy's MDT
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| CaO | 5.08% | 0.38 | |
| MgO | 2.43% | 0.26 | |
| K2O | 1.38% | 0.06 | |
| Na2O | 4.33% | 0.30 | |
| TiO2 | 0.59% | 0.03 | |
| Al2O3 | 17.48% | 0.73 | |
| SiO2 | 62.51% | 4.42 | |
| Fe2O3 | 5.35% | 0.14 | |
| MnO | 0.07% | - | |
| LOI | 0.77% | n/a | |
| Oxide Weight | 421.61 | ||
| Formula Weight | 424.88 | ||
Related Information
Comparison of three volcanic ash chemistries
This picture has its own page with more detail, click here to see it.
Notice the amazing similarity between Mount St. Helen's and Mount Pinatubo ashes. And they are from opposite sides of the planet! Yet a common commercial material in North America, Navajo Pumice, is completely different.
Links
| Typecodes |
Flux Source
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies. |
| Materials |
Volcanic Ash
Powdered volcanic ash is used to make ceramic glazes, some varieties have a chemistry similar enough to glaze that high percentages can be employed. |
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