Photo: Trey Ratcliff, Death Valley (Some rights reserved)
Rock = Solid mineral material forming part of the surface of the earth and other similar planets // Material mineral sólido que forma parte de la superficie de la tierra y otros planetas similares
Headlines
These may be the oldest rocks on Earth – CBS News
Vintage UK illustrations of rocks and minerals repurposed as a cool poster – Boing Boing
Elsewhere on the Web
British and Exotic Mineralogy
Rocks – Flickr
Wikipedia
Rock
Agate
Lapis lazuli
Pumice
Sedimentary_rock
Soapstone
Limestone
Travertine
Visitation stones
Wikipedia: Granite is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.
Features
Planeta