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Pyrophyllite is a silicate of aluminum. The sample at right has the labeled composition Al2Si4O10(OH)2. It is about 14x8 cm and is from Indian Gulch, Mariposa County, California. These samples are displayed in the Smithsonian Museum of Natural History.
磷灰石是一种铝硅酸盐。右侧样品的标注成分是Al₂Si₄O₁₀(OH)₂。其尺寸约为14x8厘米,采自加利福尼亚州马里波萨县的印度溪。这些样品陈列在史密森尼自然历史博物馆中。
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