marble
Let an agent identify marble and its varieties, explain its formation and properties, relay stone standards, quarrying and conservation information, and separate geological marble from trade marble and from other polished stones.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent identify marble and its varieties, explain its formation and properties, relay stone standards, quarrying and conservation information, and separate geological marble from trade marble and from other polished stones.
A metamorphic rock formed by recrystallisation of limestone or dolomite under heat and pressure, composed mainly of calcite or dolomite crystals, in white and many veined colours; prized since antiquity for sculpture and building, quarried at Carrara and many other places, and in the stone trade the name is also applied to polishable limestones and other rocks that are not true marble.
What it is for: Sculpture, building, decorative stone and industrial calcium carbonate.
It can be identify marble and its varieties; explain formation and properties; relay standards and conservation; distinguish true marble from trade marble.
Distinguishing features
Metamorphosed carbonate rock
Crystalline texture and polish
Soft and acid-sensitive
Trade name used loosely
What it looks like
A crystalline rock, white or coloured with veins, taking a high polish, with sugary texture on fresh surfaces.
Physical character
density: about 2.6-2.8 g per cubic centimetre
Mohs hardness: 3-4 scale - calcite
compressive strength: about 60-150 MPa
How it is recognised
Recrystallised carbonate rock with interlocking crystals
Reacts with dilute acid
Granite and quartzite do not react with acid; polished limestone is sold as marble but is sedimentary
Related models
is a kind of - from limestone
is a kind of - made of calcite or dolomite
is formed from - by metamorphism
is used as - and in sculpture
In practice
Families and kinds
calcitic and dolomitic marble
statuary white marbles such as Carrara and Pentelic
coloured and veined marbles
named commercial marbles by quarry
trade marbles that are limestones or other rocks
crushed marble and ground calcium carbonate
Standards and regulation
EN 12670 and related natural stone standards
ASTM C503 for marble dimension stone
Quarrying and worker safety rules
Heritage protection of quarries and monuments
Failure modes and hazards
Etching and staining by acids
Weathering and sugaring of outdoor marble
Misnaming other stones as marble
Silica-free but dusty quarrying hazards
Also called
+38
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What marble this is.
Identity.
Rock
Geological identification.
Rock
Rock.
- What defines marble geologically, and how is it distinguished from limestone and other stones? definition
- Is the stone a true marble or a trade marble? boundary
Variety
Varieties and quarries.
Variety
Variety.
- Which variety or quarry name applies, and what are its characteristics? provenance
- Which entry fits the specific stone? action
Geology Formation and properties.
Geology.
Formation
Formation.
Formation
Formation.
- How does marble form from limestone, and what controls colour and veining? definition
- Which entry fits metamorphism? action
Properties
Properties.
Properties
Properties.
- What are the physical properties, and how are they tested? measurement
- Which standards define the tests? provenance
Use Stone industry and art.
Use.
Quarrying
Quarrying and fabrication.
Quarrying
Quarrying.
- How is marble quarried, cut and finished, and what safety rules apply? provenance
- Which entry fits the stone industry? action
Art
Sculpture and architecture.
Art
Art.
- How has marble been used in sculpture and architecture through history? provenance
- Which references are standard? provenance
Care Conservation.
Care.
Conservation
Conservation.
Conservation
Conservation.
- How is marble conserved against weathering, pollution and staining? provenance
- Which entry fits stone conservation? action
Maintenance
Maintenance in buildings.
Maintenance
Maintenance.
- How are marble surfaces cleaned and maintained, in general terms? provenance
- Is the question about a specific monument, which needs a conservator? boundary
What the second pass must settle
- Should commercial marble names be separate entries?
- How should stone standards be linked?
- The registry entry has merged aliases naming quarry stones and grain classes; should they be split off?