Description
Location: Madagascar
Weight: 2.6 Ounces
Dimensions: 2.1 Inches Long, 1.4 Inches Wide, 0.9 Inches Thick
The item pictured is the one you will receive.
Gabbro
Gabbro is a dark, coarse-grained intrusive igneous rock formed from the slow cooling of magnesium- and iron-rich magma deep within the Earth’s crust. Its mineral composition, primarily plagioclase feldspar and pyroxene, is similar to basalt, but gabbro’s slow cooling produces a much coarser texture compared to the fine-grained basalt.
Mineral Composition of Gabbro
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Plagioclase Feldspar: Typically calcium-rich (labradorite or bytownite) and forms a major portion of gabbro’s mineral content.
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Pyroxene: Mainly clinopyroxene (usually augite); some varieties also contain orthopyroxene.
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Olivine: Present in certain types, especially olivine gabbros.
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Accessory Minerals: May include minor amounts of hornblende (in hornblende gabbros), biotite, magnetite, ilmenite, and apatite.
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Quartz and Feldspathoids: Found in small quantities in subtypes like quartz gabbros or foid-bearing gabbros.