The absence of slagginess and vesicularity in the considerable thickness exposed is also against its being a lava. |
It is worth noting that rims of silicate glass are not fragmented and vesicularity is less pronounced. |
Ash particles can have varying degrees of vesicularity and vesicular particles can have extremely high surface area to volume ratios. |
Again, vesicularity suggests the exsolution of the fluid phase on quenching of the silicate liquid. |
Morphologically, tephras are mixtures of basaltic and pumice shards, both having various degrees of vesicularity. |