CaMg(CO₃)₃

These samples of dolomite are displayed in the Smithsonian Museum of Natural History. Dolomite is a carbonate mineral which contains calcium and magnesium with the composition CaMg(CO₃)₃. This sample is about 15 cm high and originated in Eugui, Navarra, Spain.

这些方解石样本陈列在史密森尼自然历史博物馆中。方解石是一种含钙和镁的碳酸盐矿物，其化学式为CaMg(CO3)3。此样本高约15厘米，产自西班牙纳瓦拉的欧吉镇。

This dolomite sample is from Simplon Tunnel, Binnatal, Valais, Switzerland. It measures about 10x7 cm.

这种大理石样品来自瑞士瓦莱州比内塔尔的辛普隆隧道，尺寸约为10厘米×7厘米。

Though most commonly white, dolomite can take on a range of colors. This sample of dolomite is labeled as "cobaltian", presumably implying that the color arises from inclusion of a small amount of cobalt. The sample is about 8x8 cm and is from Tsumeb, Namibia.

尽管通常呈白色，方解石可以呈现多种颜色。这块方解石样本被标记为“钴质”， presumably 暗示其颜色来源于少量钴的 inclusion。样本尺寸约为8x8厘米，来自纳米比亚的Tsumeb。

Impurities and inclusions can have a dramatic effect, as this dark dolomite sample from Pinal County, Arizona shows. The sample is about 11x8 cm. The contrast is heightened by the almost clear 1.5x1.2cm specimen from Lengengach quarry, Imfeld, Binnatal, Valais, Switzerland.

杂质和夹杂物可以产生显著影响，如亚利桑那州pinale县的这一暗色蛇纹岩样本所示。该样本尺寸约为11x8厘米。来自瑞士瓦莱州宾纳塔尔的Imfeld的Lengengach采石场的几乎透明的1.5x1.2厘米样本增强了对比度。

This sample is about 15x18 cm and originated in Guanajuato, Mexico.

这个样本大约是15x18厘米，起源于墨西哥的瓜纳华托。

This dolomite specimen is from St. Louis, Missouri and has a diameter of about 14 cm.

这块方解石标本来自密苏里州圣路易斯，直径约为14厘米。

The large left specimen of dolomite is about 20x25cm and is from Romania. It is described as dolomite after calcite. The right specimen is dolomite after cerussite and is from Tsuneb, Namibia.

左侧较大的大理岩标本尺寸约为20x25厘米，来自罗马尼亚。它被描述为钙质大理岩。右侧标本为 cerussite 后的大理岩，来自纳米比亚的 Tsuneb。

Mindat: 赤铁矿