Volcanic Ash 2

Description: From Ron Roy's MDT

Oxide	Analysis	Formula
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

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.

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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.

By Tony Hansen
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