WebGabbro is a coarse-grained, dark-colored, intrusive igneous rock that contains feldspar, pyroxene, and sometimes olivine. The specimen shown above is about two inches (five … Gabbro is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. Slow-cooling, coarse-grained gabbro is chemically equivalent to rapid-cooling, fine-grained basalt. Much of the … See more The term "gabbro" was used in the 1760s to name a set of rock types that were found in the ophiolites of the Apennine Mountains in Italy. It was named after Gabbro, a hamlet near Rosignano Marittimo See more Gabbro often contains valuable amounts of chromium, nickel, cobalt, gold, silver, platinum, and copper sulfides. For example, the Merensky Reef is the world's most important source of … See more • Ocean drilling program gabbro petrology • Scientists find the elusive gabbro See more Gabbro is a coarse-grained (phaneritic) igneous rock that is relatively low in silica and rich in iron, magnesium, and calcium. Such rock is described as mafic. Gabbro is composed of See more Nearly all gabbros are found in plutonic bodies, and the term (as the International Union of Geological Sciences recommends) is … See more • Peridotite – Coarse-grained ultramafic igneous rock type • Igneous differentiation – Geologic process in formation of some igneous rocks • Fractional crystallisation – Process of rock formation See more

4.1: Classification of Igneous Rocks - Geosciences …

WebFelsic Porphyritic rhyolite Intermediate Porphyritic andesite Mafic Porphyritic basalt Felic Porphyritic granite Intermediate Porphyritic diorite Mafic Porphyrtie gabbro 344 V. Mineral Identification Key Name Hardness Luster Color Streak Heft Misc. Properties Metallic Luster Type of Cleavage or Fracture One plane, perfect 1-2 GRAPHITE Metallic … WebPorphyritic. Rhyolite is the fine-grained equivalent of this igneous rock. Granite. The coarse grained rock which is composed mainly of quartz and potassium feldspar. ... Basalt is the … hybrid health peterborough

Gabbro - Wikipedia

Web-Gabbro: A type of diorite that contains a high ratio of mica. -Norite: A type of diorite that contains a high ratio of feldspar. What Are The Uses of Diorite? Diorite is commonly used as a construction stone or as an ornamental stone. It has also been used to create sculptures, countertops, and other decorative objects. WebFeb 2, 2024 · They are dark gray, non- or low-vesicular and the matrix is microlithic-porphyritic with plagioclase, olivine and pyroxene larger crystals. Common alkaline minerals as nepheline and leucite are occasionally present. Locally, the basalts contain oval coarser-grained gabbro cumulates (up to 5 mm in size) with relatively sharp boundaries (Figure ... WebGABBRO - phaneritic (large crystals) of mafic minerals: olivine, pyroxene, etc. BASALT - aphanitic (small crystals) of mafic minerals: olivene, pyroxene, etc. Mafic rocks (basalt … hybrid hearing solutions