Where is Giallo Siena marble quarried?
Sovicille, in the province of Siena, Tuscany, Italy.
Answer
Why do two slabs of Giallo Siena marble not match exactly?
The stone itself
Because it is a natural stone and it is heavily brecciated. Within a single block the slabs differ from one another in colour distribution and in the movement of the grain, and two blocks of the same material do not carry the same yellow tone. Slab grouping is a decision, not an afterthought.
The figures
| Fact | Detail | Source |
|---|---|---|
| Within a block | Slabs differ in colour distribution and grain movement | Operator's own description [S14] [S7] |
| Between blocks | Two blocks do not carry the same yellow tone | Operator's own description [S14] [S7] |
| The published description | A deep ochre-yellow with yellow veining and pale reddish patches | Published stone sheet |
| What the workshop shows | A golden ground with a heavier brown network | Our own workshop photographs |
Why this stone behaves this way
The stone is a breccia: fragments broken and re-cemented, with the calcite seams running through it. The pattern is the result of that history, and two pieces of it will never be the same object.
What these figures are, and what they are not This site does not pin one pattern. A page that promises a single look and then shows a block that differs is the failure the finish dictionary was written to avoid.
Where these figures come from
- S1 granitalsiena.com — Giallo Siena marble technical sheet (EN standard test values; Politecnico di Torino marble laboratory)
- S7 forustone.com — Giallo Siena product page (current slab and tile references, care guidance)
- S14 marmogiallosiena.it — M.A.C. S.r.l., the Sovicille operator (variation within a block, ancient use)
Where to go next
On the same subject
More questions about Giallo Siena marble
What other names does Giallo Siena marble go by?
Giallo Siena, Giallo di Siena, Giallo Siena Unito, Siena Gold, Golden Siena, Siena Giallo, Siena Yellow, Amarillo Siena and Giallo Sienna.
Is Giallo Siena marble the same as Broccatello di Siena?
They are catalogued separately.
This answer sits on the The stone itself page, with the rest of the questions about it.
The stoneAsk for a price
A thickness, a format, a finish, a quantity and a destination will get you a quotation for Giallo Siena marble.
Why do two slabs of Giallo Siena marble not match exactly?