This is the 9259th most frequent German word.
mantel
Coat.
Here, 'Mantel' is used in its primary sense to mean 'coat,' referring to an outer garment worn for warmth or style.
Ich ziehe meinen Mantel an, bevor ich hinausgehe.
I put on my coat before going outside.
In this figurative usage, 'Mantel' is employed to mean 'cloak,' metaphorically describing the covering effect of night over the landscape.
Der Mantel der Nacht senkte sich über das Land.
The cloak of night descended over the land.
Here, 'Mantel' is used to denote a 'mantle' or covering layer, specifically referring to the ash enveloping the volcano.