East of Reykjavik, Iceland lies the mountain, Hengill. Hengill was formed from a Palagomite tuff, it is a central volcano and has a giant magma chamber beneath it. When thick basalt lava flows cool, t(Cool Places In The World)
Released to Public: The Mineral Moon (NASA/JPL) This mosaic of 53 images was recorded by the Jupiter-bound Galileo spacecraft as it passed near our own large natural satellite in The pictures were recorded through three spectral filters and combined
Seriously want one of these for my collection! Fire Agate, a variety of chalcedony with an ancient and fiery beginning, is a semi-precious natural gemstone found only in certain areas of northern Mexico and the southwestern United States.
The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs
A Petoskey stone .is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral that lived 350 million years ago. The rocks rounded in the surf along the shores of Lake Michigan near Petoskey, Michigan.
Cave pearls fill dried-out terrace pools in Hang Son Doong, Vietnam. The stone spheres formed drip by drip over the centuries as calcite crystals left behind by water, layered themselves around grains of sand, enlarging over time.