kalkflis

kalk (“limestone”) +‎ flis (“chip, splinter”), related to German Fliese (tile)

kalkflis c

1. a (slice of flat) limestone, in particular one with natural (flat and smooth) surface

   ett tunnvalv av kalkflis

   a barrel vault made from (naturally shaped) limestones

   Om dagen döljer grönfläckiga paddan sig [...] under lösbruten »kalkflis» eller i springor i kalkstenshällarna.

   During the day the green spotted toad hides under loose limestones or in the gaps between limestone slabs.

2. a layer of limestone (as part of the bedrock)
3. gravel (grain circa 2-6 mm) of limestone (used for sanding on snow)

   Halkbekämpning av G- och GC-vägar ska ske med kalkflis 2-6 mm.

   Sanding of walkpaths and walk/bikepaths will be made with limestone gravel 2-6 mm.

Often treated as the uncountable name of a substance, but sometimes individual stones are counted, where each stone is a kalkflisa.

• kalkflis in Svenska Akademiens ordbok (SAOB)