If you have inherited or found minerals, crystals, or fossils, you may be wondering how to appraise them and determine their value. Appraising a mineral collection can be a complex task, as there are many factor
What Are Tumbled Stones? Tumbled stones are small, rounded, brightly polished pieces of rocks and minerals. They are made by placing rough rocks in a machine known as a rock tumbler, which tumbles them until their edges and surfaces are smooth and polished. They are also known as "polished...
WHERE AND HOW TO COLLECT ROCKS, MINERALS, AND FOSSILS - Geology (Second Edition) - APPENDIX BELSEVIERGeology
The word fossil comes from the Latin term fossilis, meaning "dug up." Fossils are formed when an organism is buried by water containing debris and minerals, and through the effects of wind or gravity. Most fossils are found in sedimentary rocks. Fossils can also be found in metamorphic rock...
the way they moved and how fast they move. However, with any mass movement, asoillayer is separated to some degree from the underlyingbedrock. Soil is the relatively loose mixture of worn-down rock, minerals, air, water and decayed organic matter that covers the ground. Bedrock is the more...
Body fossils, or mineralized organisms — dinosaur bones and petrified wood and everything else like them— are the best-known kind of fossil. These can include even microbes and grains of pollen (microfossils, as opposed to macrofossils) where the conditions have been right. They make up most...
The fundamental principle behind radiometric dating lies in the decay of radioactive elements found in rocks and minerals. Certain naturally occurring radioactive elements, known as parent isotopes, undergo spontaneous decay over time into stable isotopes, referred to as daughter isotopes. By measuring ...
Sedimentary rocks are rocks that form out of sediment, which are bits and particles of other rocks that have weathered away. Sediment can also be formed by minerals and ions. Three main types of sedimentary rock are clastic, crystalline and organic, depending on the materials that make them up...
Fossil fuel is a common word used to refer to buried flammable geologic deposits of organic substances. They are created by decomposed plants and animals which were altered to natural gas, heavy oils or crude oil due to being exposed to a lot of heat and
interpreted as benthic algae or cyanobacteria. They are now thought to be sulfur-oxidizing bacteria like Beggiatoa. The filaments were embedded in gypsum and surrounded by dolomite, clay minerals, and pyrite. The presence of dolomite, clay minerals, and pyrite signals the presence of organic life....