原生物：不詳

輝長岩主要由入侵性火山作用形成，岩漿沿地殼裂縫上升，它冷卻並凝固成不同的礦物。是由輝石，斜長石，角閃石和橄欖輝長岩組成的。

這組礦物由架狀矽酸鹽組成的。在普通的長石主要元素的組合物可以表現在三個端元計算：

鉀長石（K-SPAR）
鈉長石
鈣長石

Living Specimens: Unknown

Gabbro is mainly formed by intrusive vulcanicity. Magma rise along the crack in the crust. It cools and solidifies into different minerals. The composition of pyroxene, plagioclase, amphibole and olivine form gabbro.

Feldspar consists of framework tectosilicate. Compositions of major elements in common feldspars can be expressed in terms of three endmembers:

1.Potassium-Feldspar (K-spar)

2.Albite

3.Anorthite

由於輝長岩主要由入侵性火山作用形成的, 它的冷卻速度較慢, 因此晶體尺寸較大。除此之外，它的二氧化矽含量較低, 所以它主要顏色較深。長石從岩漿中都侵入和噴出火成岩脈結晶，也存在於許多類型的變質岩，岩幾乎完全calcicplagioclase長石被稱為斜長組成。長石也發現在許多類型的沉積岩

As Gabbro is formed by intrusive vulcanicity, it has slower cooling rate. As a result, it is coarse-grained(larger crystal size). Other than that, it has lower silica content so it is mainly dark in color. Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcicplagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rock.

輝長岩常含有鉻，鎳，鈷，金，銀，鉑，銅等硫化物。

單眼品種的輝長岩可作為觀賞飾面石材，鋪路石，它也被稱為“黑花崗岩”。 除此之外,它也用於建造墓地的墓碑, 廚房和檯面。長石是一種常見的原料在製造玻璃，陶瓷中使用，並且在一定程度上作為一種填料和增量劑的塗料，塑料和橡膠。

Gabbro usually contains some valuable mineral such as chromium, nickel, cobalt, gold, silver, platinum as well as copper sulfides.

Ocellar varieties of gabbro can be used as ornamental facing stones, paving stones and it is also known by the trade name of ‘black granite’. It is used for graveyard headstone too. Other than that, it is also used in kitchens and countertops usually

Feldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber.

通常形成於原斷裂帶及其周圍古裂谷帶邊緣輝長岩侵入體的長帶，侵入裂谷側翼。地幔柱假說可能依賴於識別和基性超基性岩體和同時代的玄武岩火山。

Gabbro is an essential part of the oceanic crust, and can be found in many ophiolite complexes as parts of zones III and IV. Long belts of gabbroic intrusions are typically formed at proto-rift zones and around ancient rift zone margins, intruding into the rift flanks. Mantle plume hypotheses may rely on identifying mafic and ultramafic intrusions and coeval basalt volcanism