Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Minerals CHARACTERISTICS, IDENTIFYING, HOW DO MINERALS FORM? https://www.youtube.com/watch?v=-DSzlxeNCBk Mineral 1. 2. 3. 4. 5. Occurs naturally Is a solid Has a definite chemical composition Is inorganic Has a crystalline formation Ex. Quartz, halite, mica, Gold, diamonds Non-minerals on earth Ex. Water, glass, pearls, coal How do atoms of different minerals stay together- let’s review! Electric attraction Ion Atoms in their normal state have an equal # of protons & electrons. Said to be “stable” An atom that gains or loses one or more electrons becoming either more positively or negatively charged Since opposite charges attract, ions of opposite charges may bond together to form a compound/mineral. Crystal • • • A regular geometric solid with smooth surfaces called crystal faces Crystal angles and number of faces can help identify a mineral. 6 basic crystal shapes occur How can minerals form? 1) Crystallization of melted materials 2) Crystallization of materials dissolved in water 3) Heat/Pressure 4) Evaporation https://www.youtube.com/watch?v=hY32prGn6B8 https://www.youtube.com/watch?v=vHPOp69SO9E Minerals from magma As magma and lava cool to a solid, a crystal formation can occur. Speed of cooling, chemical composition and amount of gas affect the size of the crystal. Minerals from Hot Water Solutions When a hot water solution cools the elements and compounds crystallize to form minerals. Minerals formed by evaporation When a solution evaporates and leaves crystal formations behind. Idaho mining https://www.youtube.com/watch?v=rQsKRWiyuE&index=11&list=PLAcEE2_MSGW5qbVOzP7qPZJ2fn1 1disXT https://www.youtube.com/watch?v=2RZMXd4IAb0 How do we identify individual minerals? 1) Mohs hardness scale Ranks mineral hardness from 1-10 Scratch test 2) Color 3) Streak The color of a mineral’s powder Rub the mineral along a “streak plate.” 4) Luster Is it shiny??? Does it reflect light? 5) Density 6) Crystal systems 6 groups based on # of faces and angles 7) Cleavage and Fracture How a mineral looks when broken- Cleavage Fracture means no cleavage – no definite shape (quartz) 8) Special properties Fluorescence Taste Magnetism Smell (odor) Radioactive