New Hampshire State Rock


Granite: New Hampshire State Rock

 Adopted on May 31, 1985

It gave New Hampshire its Nickname of "The Granite State." New Hampshire once had a large industry surrounding the quarrying of granite. Granite was adopted as New Hampshire state rock on May 31, 1985.

Among the most popular, the hardest, and the oldest of geosymbols, granite is an official symbol of New Hampshire, Massachusetts, North Carolina, South Carolina, Vermont, and Wisconsin.

New Hampshire State Rock: Granite

Granite: New Hampshire State Rock

The word granite comes from the Latin granum, a grain, in reference to the grained structure of such a crystalline rock

Granite is an igneous stone, one that is produced by intense heat. Granite is formed from liquid magma deep beneath the earth. Extreme pressures and a slow cooling process bake granite into one of the hardest and densest stones on the planet. New Hampshire is a rock climber's paradise. From Mount Washington to the Franconia Notch there is much granite to conquer.

Granite occurs as stock-like masses and as batholiths often associated with mountain ranges and frequently of great extent. Granite has been intruded into the crust of the Earth during all geologic periods, except perhaps the most recent; much of it is of Precambrian age. Granite is widely distributed throughout the Earth.

The chief minerals of which granites are formed are feldspars and quartz and smaller amounts of mica and hornblende. They are classified as fine-grained, medium-grained, or coarse-grained. Medium-grained granites are those in which the feldspar crystals average about ΒΌ inch (6mm) in diameter. If relatively coarse-grained crystals appear in a fine grained groundmass the rock is designated as porphyritic granite. A rock may have the mineral constituents of granite but may show a banded or platy structure owing to recrystallization, folding, or other changes while the rock was in a plastic or semi-molten condition. Such metamorphic rocks are called granite gneisses.

Because of its hardness and comparative cheapness in relation to marble, granite is often used to make kitchen countertops. A granite countertop can be cut in any shape, and it is virtually unscratchable. Very hot pots must not be placed onto it though, because the temperature differential could possibly crack the granite

The Rock - GRANITE

Granite: New Hampshire State Rock

Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye.  It forms from the slow crystallization of magma below Earth's surface. Granite is composed mainly of quartz and  feldspar with minor amounts of mica, amphiboles and other minerals. This mineral composition usually gives granite a red, pink, gray or white color with dark mineral grains visible throughout the rock.

  • Igneous Rock Type: Intrusive
  • Related to: Rhyolite, pegmatite, syenite
  • Chemistry: Acidic
  • Color: White, pink, orange, gray, black
  • Texture: Phaneritic (easy to see crystals)
  • Origins: Orogenic Plutons
  • Common Minerals: Quartz, feldspars, hornblende and micas
  • Accessory Minerals: Tourmaline, phosphates, rare earth oxides, beryl, topaz, zircons, augite, sphene and apatite
  • Uses: Building material, decorative counter tops, tiles, tombstones, roads, jewelry, curling stones, marbles

New Hampshire Law

The law designating granite as the official New Hampshire state rock is found in the New Hampshire Statutes, Title 1, Chapter 3, Section 3:13.


3:13 State Rock.
Granite is hereby designated as the official state rock of New Hampshire.
Source. 1985, 11:1, eff. May 31, 1985

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