American stone for architects and designers.

Granite · New Hampshire

Concord Gray Granite

Swenson / Polycor

Light gray, fine-grained Concord Gray granite with small dark and brown flecks.
Concord Gray Granite — honed finish. Photo: Structural Stone.

Light gray granite from Rattlesnake Hill in Concord, New Hampshire, with a tight grain and small brown flecks. Historically known as Swenson Gray.

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Colors
Gray
Supplied as
Dimension stone and curbing. Confirm current block availability, sizes and fabrication requirements.
Typical uses
Landscape & site stone

Origin evidence

Extraction country
USA — verified[1]
Extraction state
New Hampshire — verified[1]
Quarry / operator
Rattlesnake Hill, Concord, New Hampshire — Swenson Granite Works[1]
MSHA Mine ID
2700083[2]
Sources (2)
  1. Source 1 · extraction country, extraction state, quarry / operator
  2. Source 2 · msha mine id

MSHA: Active · Mine ID 2700083

MSHA record details

SWENSON GRAY QUARRY

Snapshot: 18 September 2026. Mine source record 2700083 · Look up this ID at MSHA · Status effective 29 December 1982

Regulatory classification; confirm current supply separately.

Material-to-mine association supported by the linked sources.

Mine source record

Documented capabilities

Dimensional stone
Yes

Source 1 · Source 2

Restoration and matching

Historical material names
Swenson Gray

Source

Documented applications
Library of Congress; New Hampshire State House; Concord Public Library

Source

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