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Bluestone identification and geology

Bluestone rock reference specimen

Term used for various dense, blue-gray stones used in construction. Stonehenge bluestones are dolerite from Wales. Texture: Fine to medium. Rock type: Variable usually igneous. Grain size: Fine to medium. Minerals present: Variable - typically feldspar, pyroxene. Formation: Term applied to various geological rock types valued as building stone for their color and durability. Common geological settings: Preseli Hills Wales - Stonehenge , New York/Pennsylvania sandstone , Australia basalt . Common look-alikes and related entries: Basalt, Diabase, Sandstone.

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner
GeoMiner
Last updated
2026-03-30T14:39:38.412278+00:00
Review status
Published; not independently peer-reviewed
  • Rocks — U.S. National Park Service. Authoritative overview of rock groups, the rock cycle, and geologic processes.
  • Can you identify my rock or mineral? — U.S. Geological Survey. Identification limitations and routes to in-person professional verification.

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Common questions

What is Bluestone?
Term used for various dense, blue-gray stones used in construction. Stonehenge bluestones are dolerite from Wales.
How can you identify Bluestone?
Compare several properties rather than relying on colour alone. This entry records rock type: Variable usually igneous; texture: Fine to medium; grain size: Fine to medium; common minerals: Variable - typically feldspar, pyroxene. Confirm an important identification with additional field tests or qualified laboratory work.
How does Bluestone form?
Term applied to various geological rock types valued as building stone for their color and durability.
Where is Bluestone commonly found?
Preseli Hills Wales - Stonehenge , New York/Pennsylvania sandstone , Australia basalt .
What is Bluestone commonly confused with?
Bluestone may be confused with Basalt, Diabase, Sandstone. Compare multiple diagnostic properties because colour and surface appearance can overlap.

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