Santa Fiora Brown is a Tuscan fossil-bearing calcareous sandstone from the Eocene, quarried at Santafiora and Manciano in the province of Grosseto, with a warm beige-brown ground colour and discreetly visible oyster shell fossils. A classic Mediterranean wall and floor stone for façade claddings, interior surfaces, window sills and designed architectural applications in the Tuscan tradition.
More precisely a fossil-bearing calcareous sandstone (a calcareous sandstone with oyster shells from the Eocene), listed in the trade as a sandstone.
Other trade names: Arenaria con Ostree, Pietra Fiora, Pietra de Manciano, Pietra di Santafiora, Santafiora, Santafiora Ostrea
About Santa Fiora Brown
Santa Fiora Brown is the warm brown grade of the classic Tuscan Santa Fiora family — one of the most tradition-rich calcareous sandstones of central Italy. Characteristic is an evenly fine-grained slab appearance in warm beige to bronze-brown tones, often with discreetly visible oyster shell fossils (Italian “Ostrea”), which have given the stone its technical byname Santafiora Ostrea. In the international stone trade the material also runs under Santafiora, Santafiora Ostrea, Pietra de Manciano and Arenaria con Ostree. At ROSSITTIS we stock Santa Fiora Brown for façade claddings, interior wall surfaces, floor tiles, window sills, plinth details, roofed pool surrounds, fountain surrounds, reliefs and project-specific bespoke work with classic Tuscan architectural ambitions.
Geologically, Santa Fiora Brown is a fossil-bearing calcareous sandstone from the early Tertiary (Eocene, approximately 56–34 million years old), quarried in two neighbouring quarries in the province of Grosseto: the main quarry near Santafiora (DNSA number 3587, the variant with characteristic oyster shells) and nearby Manciano (DNSA number 1915, the variant as plain Pietra de Manciano without fossil content). Both belong to the same sedimentary formation of the Tuscan Eocene sandstones, classified under the International Natural Stone Index (INSK) as 92.10. The warm brown tones arise from iron oxide impregnations in the originally calcareous sandstone matrix; depending on the block, the colour tones can vary between a soft light brown, a strong bronze brown and occasionally greenish-grey accents. Santa Fiora has been a central dimension stone of southern Tuscany for centuries and is still used regularly in the local architecture — façades, plinths, mouldings, reliefs, fountains — to this day.
The technical values from DNSA document the material behaviour clearly: compressive strength 84–94 MPa, in the frost-loaded state 72.5–81.6 MPa, abrasion resistance 19.2–20.5 cm³/50 cm², water absorption 2.20 per cent. The water absorption of 2.20 per cent is considerably higher than with quartz sandstones or hard rocks — the stone is open-porous and requires a reliable impregnation. Despite the high water absorption, DNSA documents frost resistance, since the frost compressive strength lies only moderately below the dry value. Very important for the selection: Santa Fiora Brown is acid-sensitive (DNSA: “The rock is acid-sensitive!”) — contact with wine, lemon juice, vinegar or carbonated drinks leaves matt patches. Equally important: the material cannot be polished — only matt-structured finishes are possible. This peculiarity gives Santa Fiora its unmistakable naturally matt character.
At ROSSITTIS, Santa Fiora Brown is available as an unsized slab, as a floor tile, as a tread and riser, as a window sill, as a skirting, as a wall facing, as a façade element and as a project-specific cut to size. The finishes available from stock are listed in the »Finishes« block further down. Polished surfaces are technically not possible — anyone looking for a mirror-like marble or granite appearance should choose a different material.
Our honest assessment: Santa Fiora Brown is a classic Tuscan wall and façade stone with a warm Mediterranean appearance — not an all-purpose solution for heavy loads, but a designed natural stone with a strong material signature. For restorations in southern Tuscany, for Mediterranean new-build architecture, for façade claddings with local character and for designed interior wall accents, Santa Fiora is a very good choice. Acid contact, direct de-icing salt loads and heavily used external staircases should be avoided. The stone lives from naturalness and a matt appearance — not from gloss or maximum strength.
In stock
Current availability from our warehouse.
1 slab in stock · plus 1 block
Thicknesses: 2 cm · Finishes: Satin-honed · Available as: Slabs
Guide values for the stone type, taken from manufacturer and test reports. Natural stone is a natural product — individual batches and slabs can differ. For critical applications, request slab-specific test data.
Druckfestigkeit
89,0 MPa
Wasseraufnahme
2,20 %
Frostbeständig
Ja
Säurebeständig
Nein
Finishes
Santa Fiora Brown is available in a range of finishes. The finish affects appearance, feel and the care it needs.
Satin-honed
The surface is brushed — softer minerals are removed in a targeted way, creating a subtle depth with a matt appearance. A characteristic sandstone look with a warm, gently rough feel. More maintenance-intensive than hard stones, but characterful and natural — for interior surfaces and sheltered exterior applications.
Care & fabrication
As a calcareous sandstone, Santa Fiora Brown is acid-sensitive and requires correspondingly careful maintenance. Directly after laying we recommend an impregnation on a silane or polysiloxane basis — it reduces the water absorption of 2.20 per cent considerably and at the same time protects against water stains and against the penetration of colouring substances such as wine, coffee or oil. Ongoing cleaning is carried out with a pH-neutral natural stone cleaner and a soft microfibre cloth or mop; clear water alone is almost always sufficient for daily care. You should strictly avoid acidic cleaners (vinegar, citric acid, descalers), aggressive all-purpose cleaners, abrasive pads and hard brushes — acids etch the calcareous stone and can cause visible matt patches. Take up acids spilt on interior surfaces (wine, lemon juice) promptly. Outdoors, refrain from direct de-icing salt contact; after the winter, rinse salt residues off thoroughly with clear water. We recommend renewing the impregnation every two to three years depending on the load — more frequently on heavily used floor surfaces and exposed external surfaces.
Frequently asked questions
What does “Santafiora Ostrea” mean?
“Ostrea” is the scientific designation for oysters. Santa Fiora Brown contains characteristic oyster shell fossils from the Eocene period (approximately 56–34 million years ago), which are discreetly visible in the slab appearance. DNSA number 3587 is the official entry for this fossil-bearing variant. The nearby Manciano variant (DNSA 1915) is without oyster inclusions.
Which other designations does the material carry?
On the market, Santa Fiora Brown runs under Santafiora, Santafiora Ostrea, Pietra de Manciano and Arenaria con Ostree. All designations refer to the same Tuscan calcareous sandstone family from the province of Grosseto, with two very similar main varieties (with and without fossils).
Can Santa Fiora Brown be polished?
No — a polished mirror-gloss surface is technically not possible with this material. Available in matt finishes — the variants available from stock are listed in the »Finishes« block. Anyone looking for a polished appearance should choose a different stone — the character of Santa Fiora lies in its naturally matt appearance.
Is Santa Fiora Brown frost-resistant?
Yes, DNSA documents frost resistance. The compressive strength in the dry state is 84–94 MPa, in the frost-loaded state 72.5–81.6 MPa — a moderate loss of strength through freeze-thaw cycles, which nevertheless qualifies the material as frost-resistant. Even so, in the case of direct weathering in heavily frost-loaded regions we recommend a project-specific suitability assessment and a good impregnation.
Is Santa Fiora Brown suitable for kitchen worktops?
Only to a limited extent. As an acid-sensitive calcareous sandstone, wine, lemon juice, vinegar and tomato sauce leave visible matt patches. With a good impregnation, Santa Fiora can be used for design-accented bar counters or breakfast surfaces — for classic main worktops with a high acid load, hard rocks such as granite or quartzite are better suited.
Where is Santa Fiora quarried?
Santa Fiora is quarried in two neighbouring quarries in the province of Grosseto in southern Tuscany: the main quarry near Santafiora (the variant with oyster shells, DNSA 3587) and nearby Manciano (the variant without fossils, DNSA 1915). Both quarries extract from the same sedimentary Eocene formation.
How do I clean and care for Santa Fiora Brown?
Daily care with a pH-neutral natural stone cleaner and a soft microfibre cloth. Acidic cleaners (vinegar, citric acid, descalers) and aggressive all-purpose cleaners must be strictly avoided — they etch the calcareous stone. An impregnation on a silane basis after laying is mandatory; it reduces the water absorption considerably. Renewal every two to three years is recommended, more frequently on external surfaces.
What does Santa Fiora Brown cost?
The price depends on the batch, thickness, surface finish and fabrication — with natural stone there is no serious flat rate per square metre. Business customers see prices once their B2B account is activated; private customers receive a complete quote through a fabricator near them.
