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Mt. St. Helens Ash

Alternate Names: Mount Saint Helen\'s Ash

OxideAnalysisFormula
CaO5.08%0.385
MgO2.43%0.256
K2O1.38%0.062
Na2O4.33%0.297
TiO20.59%0.031
Al2O317.48%0.728
SiO262.51%4.420
Fe2O35.36%0.142
MnO0.08%0.005
LOI0.75
Oxide Weight421.69
Formula Weight424.88
If this formula is not unified correctly please contact us.

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


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Mt. St. Helens Ash" descrip="" searchkey="Mount Saint Helen\'s Ash" loi="0.00" casnumber=""> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="5.080" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="2.430" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="1.380" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="4.330" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.590" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="17.480" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="62.510" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="5.360" tolerance=""/> <oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.080" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="0.750" tolerance=""/> </volatiles> </material>


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