Chalcedony Quartz

石英

Quartz is silicon dioxide, SiO₂. Quartz is abundant in the Earth's crust, being the chemically simplest form of the silicates. All the samples here are displayed in the Smithsonian Museum of Natural History. One of the names applied to quartz is chalcedony. It is not a specific name and has been used for a variety of types of quartz. It is used here following the usage at Smithsonian to describe those types of quartz which were formed in an apparent tubular formation, like multiple flows or stalactite forms. The sample at right is about 10x35 cm and is from Namibia.

石英是二氧化硅，SiO₂。石英在地壳中很丰富，是硅酸盐中化学最简单的形式。所有这些样本都陈列在史密森尼自然历史博物馆中。石英的一个名称是石英岩，这不是一个特定的名称，已用于各种类型的石英。这里使用该名称是遵循史密森尼博物馆的用法，用来描述那些形成于明显管状结构的石英类型，如多层流动或钟乳状结构。右边的样本大约是10×35厘米，来自纳米比亚。

The specimen of chalcedony at left is about 13x25 cm and is from Palmeiras, Brazil. The specimen below is about 1.2x1.5 cm and is from Africa.

左边的石英标本尺寸约为13x25厘米，来自巴西的Palmeiras。下方的标本尺寸约为1.2x1.5厘米，来自非洲。

A comment on the U. S. Geological Survey site is "Chalcedony is a catch all term that includes many well known varieties of cryptocrystalline quartz gemstones."

关于美国地质调查局网站的一条评论是‘石英类变质岩是一种总称，包括许多著名的隐晶质石英宝石品种。

This specimen of chalcedony is about 9x9 cm and is from Brazil.

这种石英标本大小约为9x9厘米，来自巴西。

This specimen of chalcedony is about 8x20 cm and is from Owyhee River, Malheur County, Oregon.

这种石英是一种约8厘米×20厘米的标本，来自俄勒冈州马霍恩县奥维hee河。

The specimen at left above is about 8x12 cm and is from Madagascar. More detail below. The speciment at right above is about 18x20 cm and is from Morgan Hill, California.

上图左侧的标本约为8x12厘米，来自马达加斯加。详情如下。上图右侧的标本约为18x20厘米，来自加利福尼亚州莫根希尔。