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1.a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar.
一种透明或半透明的宝石，带珍珠光彩，有的样品是正长石，有的是斜长石。收藏指正
2.A rare plagioclase feldspar with high calcium oxide content occurring in igneous rocks.
钙长石一种氧化钙含量很高稀有斜长石，多出现于火成岩中收藏指正
3.the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene.
最常见的凝固火山岩，是一种致密的深灰色火成岩，纹理细密，主要由富钙的斜长石和辉石组成。收藏指正
4.A gray, fine-grained volcanic rock, chiefly plagioclase and feldspar.
安山岩一种灰色的，纹理细密的火山岩，主要是斜长石和似长石收藏指正
5.The leucogranites have apparently twoperiods: earlier two mica leucogranites, the mineral assemblages are biotite+muscovite±garnet(quartz+plagioclase+alkaline-feldspar); the later tourmaline leucogranites, the mineralassemblages are muscovite+tourmaline±biotite±garnet(quartz+plagioclase+alkaline-feldspar).
岩体明显分两期侵入,早期二云母淡色花岗岩,矿物组合为黑云母+白云母±石榴石(石英+斜长石+碱性长石),晚期电气石淡色花岗岩,矿物组合为白云母+电气石±黑云母±石榴石(石英+斜长石+碱性长石)。收藏指正
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