化學組成, 鍵及結構：(礦物)

石英，長石，石榴石和雲母

Chemical composition, bonding and structure: (Mineral)

Quartz, feldspar, garnet and mica

原生物：不詳

石榴石偉晶岩的成因主要為入侵性火山作用，地幔中的岩漿透過地殼中的裂縫向上溢出，由於火山殘餘的溶漿緩慢，冷卻並凝結為晶體，各種礦物如長石、雲母、石榴石及石英凝聚成為石榴石偉晶岩。

Living Specimens: (Unknown)

Garnet pegmatite is mainly formed by intrusive vulcanicity. Magma in the mantle rises through the cracks in the crust. The cooling rate is slow. It cools and solidifies into different minerals. The aggregation of feldspar, mica, garnet and quartz forms garnet pegmatite.

偉晶岩因為其經常含有大粒晶體而得名，具有粗粒結構，粒徑通常超過50毫米，一般顏色較淺，但常產於深成岩的體內或周圍，其包含的晶體經常是有價值的礦物。石榴石就是其一在偉晶岩上能被發現的晶體。常見的石榴石為紅色，但其顏色的種類十分廣闊。相比於典型的火成岩，偉晶岩的礦物形成是相當不均勻，可能顯示不同的礦物組合區。石榴石偉晶岩是侵入火成岩，含四種晶體狀礦物，包括長石（粉紅色）、雲母（黑色）、石榴石 (紅色) 及石英（奶白色），顯現互鎖岩理。由於岩漿侵入地底深層時，冷卻緩慢，故岩中礦物顆粒通常較大。石榴石偉晶岩堅硬度亦被視為頗高。

Garnet pegmatite has large and rough crystals, with crystals usually over 5 cm in size. Pegmatite is in light color, but it is surrounded by plutonic rocks which contains valuable minerals. Garnet is one of the crystals that can be found in pegmatite. Garnets are in red color, though it has a wide color range. Compared to typical igneous rocks, garnet pegmatite are rather inhomogeneous and may show zones with different mineral assemblages. Garnet pegmatite is an intrusive igneous rock composed mainly of crystalline silicate minerals such as quartz (milky), feldspar (pale pink), garnet (red) and mica (black). Minerals are shown to be interlocking and coarse-grained, for its slow cooling rate deep underground. It has a high hardness.

純淨的石榴石由古至今都被視為寶石, 通常為綠色，紅色，黃色和橙色。石榴石會在玻璃工業中使用，而有的則用作寶石收藏。 至於偉晶岩，它在經濟而言上重要，因為它常包含稀土及寶石，帶來經濟收益。

Pure crystals of garnet are still used as gemstones. The gemstones occur in green, red, yellow, and orange. Garnets are used in the glass industries, some of them are for collections as gemstones. For pegmatite, they are important with economic benefits because they often contain rare earth minerals and gemstones.

石榴石分佈全世界，例如可在美國，俄羅斯，肯尼亞，坦桑尼亞，馬達加斯加和土耳其中找到。至於偉晶岩，因為它們是火成岩，所以它們在一些曾經有火山活動的地方也可能出現。在全球，偉晶岩常在大陸地上及變質帶間被發現。

Garnets are scattered around the world, for example, they can be found in the United States, Russia, Kenya, Tanzania, Madagascar, and Turkey. For pegmatite, they can be found near places with volcanic activities as it is an igneous rock. Worldwide, pegmatite occurrences are within the major continents, and within metamorphic belts.