Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Actinolite is a silicate with composition Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂, all big-8 elements except hydrogen. The sample above is about 11x40 cm and is from Sears Creek, Wenatchee, National Forest, Washington. It tends to form in long, thin crystals. These samples are displayed in the Smithsonian Museum of Natural History.

角闪石是一种含钙的硅酸盐，化学式为Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂，其中包含除了氢以外的所有大元素。上面的样品尺寸约为11x40厘米，产自华盛顿州温纳奇国家森林的塞尔斯溪。它倾向于形成细长的晶体。这些样品陈列在史密森尼自然历史博物馆中。

This actinolite sample shows a formation pattern somewhat similar to the above, but very different from the fibrous form below. This sample is formed after pyroxene. It is about 20x16 cm and is from Calumet mine, Salida, Colorado.

该角闪石样品显示出一种与上述类似的形成模式，但与下方的纤维状形式非常不同。该样品是在辉石之后形成的，尺寸约为20x16厘米，来自科拉梅特矿，位于科罗拉多州萨利达。

This sample of actinolite has a very different appearance, forming in a fibrous mass. The sample is about 18x16 cm and is from Fairfax quarry, Centreville, Virginia. It has an appearance similar to those magnesium silicates which are collectively labeled "asbestos".

这种角闪石样品外观非常不同，形成于纤维状的质地上。样品尺寸约为18x16厘米，来自弗吉尼亚州Centreville的Fairfax采石场。其外观与那些被统称为‘石棉’的镁硅酸盐相似。

This sample is labeled as an actinolite-talc schist. It is evaluated to be a Catalina Schist of about 100 million years age from the Santa Catalina Island, California. The container of water shows how much water the rock contains. It formed deep in a subduction zone when the altered oceanic lithosphere began to release water. The sample is about 25 x 20 cm.

这种样本被标记为角闪石-滑石片岩。它被评估为来自加利福尼亚州圣卡塔琳娜岛、约1亿年前的卡塔琳娜片岩。水容器显示岩石中含有多少水分。它是在板块俯冲带深处形成的，当变质的洋壳开始释放水分时。该样本尺寸约为25 x 20厘米。

These large crystals of quartz have actinolite inclusions.

这些大的石英晶体含有角闪石包裹体

Mindat: Actinolite

Mindat: 赤铁矿

Actinolite

Ca2(Mg,Fe)5Si8O22(OH)2

Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂