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Pick a Postcard - Rocks, Minerals and Fossils

These three crystals of the mineral quartz show how the same type of mineral can have different colors!
Windows to the Universe

Amethyst crystals from Brazil
Courtesy of Corel Photography

A fossil brachiopod!
Oklahoma University/Earth SceinceWorld Imagebank

This photograph shows several crystals of the mineral, calcite. The crystals in this example are shaped like pyramids. Therefore, the crystals are known as "dogtooth".
Courtesy of Corel Photography

Orthoclase feldspar
Windows to the Universe Image

Windows to the Universe/L.Gardiner

This is a photograph of the mineral, hematite. Hematite contains lots of iron. The chemical formula for hematite is Fe2O3.
Windows to the Universe original image

Crystals of the mineral Pyrite from Peru
Courtesy of Corel

These two examples show the shape of individual quartz crystals.
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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA