Rock butter (also known as
stone butter) is a soft
mineralA mineral is a naturally occurring solid formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure, and specific physical properties. A rock, by comparison, is an aggregate of minerals and/or mineraloids, and need not have a specific...
substance found oozing from
alumAlum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated aluminium potassium sulfate with the formula KAl
2.12H
2O...
slates.
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Rock butter (also known as
stone butter) is a soft
mineralA mineral is a naturally occurring solid formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure, and specific physical properties. A rock, by comparison, is an aggregate of minerals and/or mineraloids, and need not have a specific...
substance found oozing from
alumAlum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated aluminium potassium sulfate with the formula KAl
2.12H
2O...
slates.
It consists of native alum mixed with
clayClay is a naturally occurring material composed primarily of fine-grained minerals, which show plasticity through a variable range of water content, and which can be hardened when dried and/or fired...
and oxide of iron, usually in soft masses of a yellowish white colour, occurring in cavities and fissures in argillaceous slate.