A 78 rpm shellac record is in Swedish called a "stenkaka", a "stone cake", because it was brittle and if you dropped it on the floor it was likely to shatter.
When I look this up on Google, DeepL and Wiktionary there seems to be no "street English" for these records, they're just called grammophone records.
Is there really no common term in English for shellac records that is not just "shellac record" or "those grammophone records we had before vinyl"?