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Gabbro is usually black or dark green in color.

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Gabbro is usually black or dark green in color.

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Basalt is usually grey to black in color, but rapidly weathers to brown or rust-red due to oxidation of its mafic (iron-rich) minerals into hematite and other iron oxides and hydroxides. 

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Basalt is usually grey to black in color, but rapidly weathers to brown or rust-red due to oxidation of its mafic (iron-rich) minerals into hematite and other iron oxides and hydroxides. 

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The most common use of gabbro is as a crushed stone or aggregate.  Crushed gabbro is used as a base material in construction projects, as a crushed stone for road construction, as railroad ballast, and anywhere that a durable crushed stone is needed as fill

# data[].attributes.subject
The most common use of gabbro is as a crushed stone or aggregate.  Crushed gabbro is used as a base material in construction projects, as a crushed stone for road construction, as railroad ballast, and anywhere that a durable crushed stone is needed as fill

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Gabbro is also used to make a number of rough-cut products such as curbing, ashlars, paving stones, and other products.

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Gabbro is also used to make a number of rough-cut products such as curbing, ashlars, paving stones, and other products.

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Gabbro can be polished to a brilliant black luster.  Brightly polished gabbro is used to  make cemetery markers, kitchen counter tops, floor tiles, facing stone, and other dimension stone  products.  It is a highly desirable rock that stands up to weathering and wear

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Gabbro can be polished to a brilliant black luster.  Brightly polished gabbro is used to  make cemetery markers, kitchen counter tops, floor tiles, facing stone, and other dimension stone  products.  It is a highly desirable rock that stands up to weathering and wear

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Gabbros are equivalent in composition to basalts.  The difference between the two rock types is their grain size.  Basalts are extrusive igneous rocks that cool quickly and have fine-grained crystals. Gabbros are  intrusive igneous rocks that cool slowly and have coarse-grained crystals

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Gabbros are equivalent in composition to basalts.  The difference between the two rock types is their grain size.  Basalts are extrusive igneous rocks that cool quickly and have fine-grained crystals. Gabbros are  intrusive igneous rocks that cool slowly and have coarse-grained crystals

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Gabbro is a coarse-grained, dark-colored, intrusive igneous rock.  It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite.  It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry. It is used for everything from crushed stone base materials at construction sites to polished stone counter tops and floor tiles.

# data[].attributes.subject
Gabbro is a coarse-grained, dark-colored, intrusive igneous rock.  It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite.  It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry. It is used for everything from crushed stone base materials at construction sites to polished stone counter tops and floor tiles.

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Basalt is used for a wide variety of purposes.  It is most commonly crushed for use as an aggregate in construction projects.  Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes.  Basalt is also  cut into  dimension stone. Thin slabs of basalt are cut and sometimes polished for use as floor tiles, building veneer, monuments, and other stone objects.

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Basalt is used for a wide variety of purposes.  It is most commonly crushed for use as an aggregate in construction projects.  Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes.  Basalt is also  cut into  dimension stone. Thin slabs of basalt are cut and sometimes polished for use as floor tiles, building veneer, monuments, and other stone objects.

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Most of the basalt found on Earth was produced in just three rock-forming environments:   1) oceanic divergent boundaries, 2) oceanic hotspots, and 3) mantle plumes and hotspots beneath continents.  The images on this page feature some of these basalt-forming environments.

# data[].attributes.subject
Most of the basalt found on Earth was produced in just three rock-forming environments:   1) oceanic divergent boundaries, 2) oceanic hotspots, and 3) mantle plumes and hotspots beneath continents.  The images on this page feature some of these basalt-forming environments.

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Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow,  but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition  similar to gabbro. The difference between basalt and gabbro is  that basalt is a fine-grained rock while gabbro is a coarse-grained rock.

# data[].attributes.subject
Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow,  but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition  similar to gabbro. The difference between basalt and gabbro is  that basalt is a fine-grained rock while gabbro is a coarse-grained rock.