01 / Geological family
Origin and composition
- Geological family
- Sedimentary
- Origin and composition
- Fossiliferous limestone with bivalves and organic matter
- Origin
- Podpeč, south-west of Ljubljana, Slovenia
- Appearance and identification
- Dark grey-black with white shells
Sedimentary rocks form through accumulation, compaction and cementation of sediments, or precipitation of minerals. Sandstones, limestones and travertines belong to this broad family but have different compositions and structures. Visible bedding can influence slab design and cutting direction. Selection calls for attention to pores, cement, discontinuities and the specific product rather than assuming that every member behaves like one familiar stone.
02 / History and curiosities
History and curiosities
It is associated with Jože Plečnik’s work and the National and University Library in Ljubljana.
03 / Applications and design
Applications and design
Recorded uses include thresholds, door frames, walls, monuments and fountains.
Finishes and processes ↗04 / Technical interpretation
What to ask your supplier
The local name marmor does not indicate metamorphism; use care appropriate to carbonate stone.
05 / Care and maintenance
Care and maintenance
Remove dust and grit with soft tools, wash with a compatible neutral cleaner, then rinse and dry. Identify composition before using stain or scale removers: carbonate stones are acid-sensitive. Test every treatment in an inconspicuous area. An impregnator can reduce absorption but does not make a material waterproof or stain-proof.
Thoughtful cleaning, protection and maintenance ↗07 / Sources and further reading
