Function: noun
Date: circa 1898
: a dark coating which is found on rocks after long exposure in desert regions and whose color is due to iron and manganese oxides
Function: noun
Date: circa 1898
: a dark coating which is found on rocks after long exposure in desert regions and whose color is due to iron and manganese oxides
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012