basalt
Let an agent explain basalt, relay formation, composition, forms and uses from geology sources, describe the named forms, and distinguish basalt from granite, gabbro as its intrusive equivalent, andesite and other volcanic rocks.
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 explain basalt, relay formation, composition, forms and uses from geology sources, describe the named forms, and distinguish basalt from granite, gabbro as its intrusive equivalent, andesite and other volcanic rocks.
A dark, fine-grained volcanic rock formed from rapidly cooled low-silica basaltic lava, the most common rock in the Earth s crust and ocean floor, rich in iron and magnesium minerals, with forms the registry aliases name such as mid-ocean ridge basalt, flood basalt covering vast areas, leucite basalt and named regional basalts, and the trade term bluestone; basalt forms lava flows, columnar joints as at the Giant s Causeway, and much of the seafloor, and it is quarried for aggregate and building stone. Some basalt dusts and fibres raise occupational health considerations.
What it is for: Common volcanic rock and building material.
It can be explain formation and composition; relay forms and features; describe named forms; relay uses.
Distinguishing features
Dark and fine-grained
Low silica
Forms seafloor and columns
Iron and magnesium rich
What it looks like
A dark grey to black fine-grained rock, sometimes forming columns.
Physical character
silica: low, about 45-52 percent note
most common crustal rock: and ocean floor note
registry parents: volcanic rock, basic rock note
How it is recognised
Dark fine-grained volcanic rock
Bluestone, Mendig basalt, leucite basalt, Kopaonik basalt, mid-ocean ridge basalt, flood basalt
Granite is coarse and silica-rich; gabbro is basalt s intrusive equivalent; andesite has more silica; other volcanic rocks differ in composition
Related models
is a kind of - in registry terms
is the extrusive equivalent of -
is contrasted with -
is contrasted with -
In practice
Families and kinds
tholeiitic basalt
alkali basalt
mid-ocean ridge basalt
flood basalt
Standards and regulation
Aggregate and building stone standards
Occupational dust exposure limits
Failure modes and hazards
Occupational dust exposure in quarrying
Confusing basalt and other dark rocks
Confusing extrusive and intrusive rocks
Also called
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.
Understand What basalt is.
Science.
Definition
Definition.
Definition
Definition.
- What is basalt, and how does it differ from granite, gabbro, andesite and other volcanic rocks? definition
- Is the question about geology, building stone or quarry dust safety? boundary
Forms
Named forms.
Forms
Forms.
- What are mid-ocean ridge basalt, flood basalt, leucite basalt and bluestone? definition
- Which entry fits the specific form? action
Geology Geology.
Science.
Formation
Formation.
Formation
Formation.
- How does basalt form from cooling lava? provenance
- Which references are standard? provenance
Columns
Columnar jointing.
Columns
Columns.
- How do columnar joints such as the Giant s Causeway form? provenance
- Which entry fits columnar basalt? action
Composition Composition.
Science.
Minerals
Minerals.
Minerals
Minerals.
- What minerals make up basalt? provenance
- Which sources are cited? provenance
Seafloor
Ocean crust.
Seafloor
Seafloor.
- Why does basalt form most of the ocean floor? provenance
- Is the information accurate? boundary
Context Uses.
Regulation.
Uses
Uses.
Uses
Uses.
- How is basalt used for aggregate, building and basalt fibre? provenance
- Which entry fits crushed stone? action
Flood basalt
Flood basalt provinces.
Flood basalt
Flood basalt.
- What are flood basalt provinces, and how are they linked to mass extinctions, with findings attributed? provenance
- Is the presentation neutral and attributed? boundary
What the second pass must settle
- Should flood basalt be a separate entry?
- How should named regional basalts be treated?
- How should the bluestone trade term be documented?