BeAl₂O₄

These samples of chrysoberyl are displayed in the Smithsonian Museum of Natural History. Chrysoberyl is an oxide mineral of beryllium with the composition BeAl₂O₄. The sample at left is about 10 cm across and is from Black Mountain, Rumford, Maine. This sample is described as chrysoberyl with quartz and schorl. A gem-quality variety of chrysoberyl is called Alexandrite.

这些金绿石样品陈列在史密森尼自然历史博物馆中。金绿石是一种铍的氧化物，化学式为BeAl₂O₄。左侧的样品宽约10厘米，来自缅因州rumford黑山。该样品被描述为金绿石伴含石英和黑云母。一种宝石级的金绿石被称为 Alexandrite。

These three chrysoberyl gems are from Minas Gerais, Brazil. They measure 46.3, 13.8 and 114.3 carats.

这三颗金绿石宝石来自巴西的米纳斯吉拉斯州。它们的重量分别为46.3、13.8和114.3克拉。

This gem measures 120.5 carats and is from Sri Lanka.

这颗宝石重120.5克拉，产自斯里兰卡。

This large twinned crystal of chrysoberyl is about 20cm across and is from Espirito Santo, Brazil.

这块重达20厘米的金绿石晶体来自巴西的埃斯皮里图圣弗兰西斯科。

These chrysoberyl crystals are from Colatina, Espirito Santo, Brazil and are about 10 cm across. Each of them consists of three individual crystals that grew together at 60 degree angles, creating a snowflake effect. The angle is determined by the molecular geometry of chrysoberyl.

这些金绿石晶体来自巴西埃施皮里托圣奥古斯丁州的科拉蒂纳，直径约10厘米。每个晶体由三个相互生长的个体晶体组成，以60度的角度生长在一起，形成雪花状的效果。这个角度由金绿石的分子几何结构决定。

This is another example of cyclic twinned crystals of chrysoberyl. This sample is about 8 cm across and is from Minas Gerais, Brazil.

这是另一种黄水晶的环状孪生晶体。该样品宽约8厘米，产自巴西米纳斯吉拉斯州。

At right is the Maharani Cat's Eye, a 58.2 carat chrysoberyl gem which is one of the finest known cat's eyes.

右侧是马哈拉尼猫眼石，这是一种58.2克拉的金绿石宝石，是已知最优质的猫眼石之一。

Mindat: 锰铬矿

Chrysoberyl

BeAl2O4

BeAl₂O₄