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Mt. St. Helens Ash

Alternate Names: Mount Saint Helen\'s Ash

Oxide Analysis Formula
SiO2 62.51% 4.42
Al2O3 17.48% 0.73
TiO2 0.59% 0.03
Fe2O3 5.36% 0.14
MgO 2.43% 0.26
MnO 0.08% 0.00
CaO 5.08% 0.38
Na2O 4.33% 0.30
K2O 1.38% 0.06
LOI0.75%
Oxide Weight 421.69
Formula Weight 424.88

Notes

Mount St. Helens Ash is available by the grace of the eruption of the above mentioned mountain in Washington State USA about 1980. Large areas of the state were blanketed by a layer of the ash that people had to clear with shovels like snow.

It has been speculated that P2O5, which shows up in some other analyses that have been done, is responsible for the typical "skin" of color that appears over the body of the glaze.

Atomic Absorption Analysis results 6/9/80
DR Pevear, Dept of Geology, West Washington Univ., Bellingham, WA

1 2 3 4 5 6 7 8 9
SiO2 61.90 66.05 60.81 64.54 62.99 63.46 64.20 65.78 63.92
Al2O3 19.43 18.46 19.69 18.69 17.34 16.62 17.23 16.62 16.31
TiO2 .73 .52 .73 .60 .63 .63 .60 .49 .49
Fe2O3 6.84 4.49 6.97 5.46 5.91 5.57 4.94 4.44 4.59
MgO 3.63 1.78 3.82 2.62 2.74 2.40 1.94 1.69 1.71
MnO .11 .07 .10 .08 .09 .08 .07 .06 .06
CaO 6.05 4.19 6.27 5.56 5.53 5.39 5.12 4.35 4.13
Na2O 4.36 4.59 4.33 4.49 4.21 4.41 4.60 4.62 4.16
K2O 1.06 1.65 .97 1.29 1.23 1.43 1.46 1.63 1.94
LOI .28 .80 .50 .20 n.d. .96 .58 .76 2.04

The analysis provided is an average of the above.

1 Yakima, WA
2 Spokane, WA
3 Yakima, WA (S34 T9N R5E)
4 Mt. St. Helen (S34 T9N R5E) USGS
5 Mt. St. Helen USGS
6 Randle, WA
7 Castle Rock, WA
8 Missoula, MT
9 Denver, CO

Related Information

Links

Articles Volcanic Ash
Joseph Herbert overviews the technical and practical aspects of this interesting group of materials
Materials Navajo Pumice
Materials Volcanic Ash
Materials Mount Pinatubo Ash
Suppliers VOLCANO
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.

By Tony Hansen


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