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橄榄石:颜色稳定、缅甸和美国为主要产地

【摘要】:Peridot·楔形晶顶、短柱状橄榄石晶体和宝石橄榄石是镁铁的简单硅酸盐矿物,因其颜色多为橄榄色而得名。现代珠宝界将橄榄石指定为八月生辰石。橄榄石颜色源自本身含铁,是一种自色宝石,因此颜色比较稳定。缅甸橄榄石因色泽浓艳,在宝石界名闻遐迩。宝石级橄榄石也分布较为广泛,主要产于玄武岩及超基性岩的晶洞和裂隙中。当今世界上最主要的宝石级橄榄石原料产地为美国。“睡莲叶”状内含物和铬铁矿内含物是橄榄石最典型的内含物特征。

Peridot

·楔形晶顶、短柱状橄榄石晶体宝石

橄榄石是镁铁的简单硅酸盐矿物,因其颜色多为橄榄色而得名。橄榄石是一种十分古老的宝石,公元前1000多年,古埃及人就用它做饰物。古罗马人称其有太阳般神力,可驱除邪恶,带来光明。现代珠宝界将橄榄石指定为八月生辰石。

橄榄石属斜方晶系,晶体为短柱状,晶顶呈楔形,但完整晶形很少见,大多为不规则粒状。橄榄石颜色源自本身含铁,是一种自色宝石,因此颜色比较稳定。常见黄绿色、绿色和褐绿色。最佳颜色被认为是中深度微黄绿色,越接近绿色越好。缅甸橄榄石因色泽浓艳,在宝石界名闻遐迩。橄榄石一般都比较透明,少有杂质,呈玻璃光泽。成品宝石通常小于3克拉,5克拉以上不多见,超过10克拉极为罕见。

Peridot is a gem-quality variety of olivene in which iron and magnesium substitute freely. While most crystals tend to be massive or granular,well-formed crystals are rare and tend to be tabular with wedge-shaped terminations. Peridot is usually yellow-green to olive green but can also be yellowish brown or black. Olivine and its variants make up roughly 50% of the earth’s mantle and is one of the most abundant minerals on Earth by volume.Peridot sized at a few carats is fairly common but large stones weighting 10 carats or above are hardly ever seen.

The typical inclusions of peridot are octahedron chromite crystals and "lily pad" cleavage discs (page 198).

·缅甸橄榄石

·镁橄榄石原石

·环绕橄榄石中微小含晶发育的扁平张力裂隙,是橄榄石典型的内含物特征,称为“睡莲叶”内含物

·八面体铬铁矿是橄榄石中典型的常见内含物

·橄榄石戒指

橄榄岩是地球上重要的造岩矿物。宝石级橄榄石也分布较为广泛,主要产于玄武岩及超基性岩的晶洞和裂隙中。当今世界上最主要的宝石级橄榄石原料产地为美国。中国河北张家口、吉林蛟河产有优质宝石级橄榄石原料。“睡莲叶”状内含物和铬铁矿内含物是橄榄石最典型的内含物特征。

·缅甸橄榄石矿井