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From The Town Of Bedrock, Its a Place Right Out Of History

From The Town Of Bedrock, Its a Place Right Out Of History. A mineral defined. the solid portion of the earth is composed of rocks rocks are composed of minerals All minerals are defined by the following : Naturally occurring: mother nature makes minerals…not us!

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From The Town Of Bedrock, Its a Place Right Out Of History

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  1. From The Town Of Bedrock, Its a Place Right Out Of History

  2. A mineral defined • the solid portion of the earth is composed of rocks • rocks are composed of minerals • All minerals are defined by the following: • Naturally occurring:mother nature makes minerals…not us! • Inorganic:made of things that are not living and never will be living! • Solid: hard and breakable • Homogeneous: the same throughout • Definite chemical composition:unique combination of elements • Crystalline structure:repeating pattern of atoms that creates crystals

  3. A mineral identified • There are 6 traits you can test to help you correctly identify a mineral sample • Color • Hardness • Streak • Cleavage/Fracture • Luster • Unique characteristics

  4. Color • Color is okay to look at initially, but you can not base your decision only on that one trait • Why? Trace elements can vary the external color. • If we only looked at color, we would not identify it correctly. These are both diamonds

  5. Can You Scratch It? • When you try to scratch a mineral, you are testing its hardness • If it can be scratched, then it is softer than the object you used to scratch it • If it cannot be scratched, then it is harder than the object you used to scratch it • Common minerals and their hardness are ranked on Moh’s Hardness Scale, listed from the softest to the hardest

  6. Field hardness chartpage 106

  7. We Have a Streaker!! • The streak of a mineral is the mineral in its powdered form • Minerals will only have a streak if they are softer than the streak plate (which has a hardness of 7) • If the mineral has a metal in its chemical formula, it will usually leave a streak • The streak color will not always be the same color as the mineral…so don’t assume!

  8. I Need a Break!!! • Cleavage and fracture are two terms used to describe how a mineral breaks • Cleavagemeans it breaks with smooth, flat surfaces • Fracturemeans the mineral breaks along jagged surfaces

  9. Oh, How it Shines! • How a mineral shines describes its luster • If it shines like a metal, it has metallic luster • If it does not shine like a metal, it has nonmetallic luster • Dull • Glassy • Earthy • Pearly • Waxy

  10. Unique characteristics • Magnetism (magnetite) • Double refraction, double image (calcite) • Fizzes when acid is placed on it (calcite) • Fluorescence (glows under a black light) • Olfactory (sulfur) smell • Specific gravity: THE BEST TEST TO HELP YOU IDENTIFY A MINERAL!

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