Home
Random
Log in
Settings
Donations
About Wiktionary
Disclaimers
Search
polishing slate
Language
Watch
Edit
English
edit
Noun
edit
polishing
slate
(
countable
and
uncountable
,
plural
polishing slates
)
A
mineral
used for
polishing
glass
,
marble
,
and
metals
, composed chiefly of
silica
, with a little
alumina
,
lime
,
iron oxide
,
and
water
.