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Understanding the Unique Properties of Minerals: Magnetism, Taste, Smell, and Optical Phenomena

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This guide explores the special properties of minerals, focusing on their magnetic attraction, tactile sensations, distinctive tastes and smells, and unique optical characteristics. Discover how minerals like magnetite are attracted to metals, why halite tastes salty, and the infamous smell of sulfur. Delve into optical phenomena such as double refraction in calcite, the iridescence of chalcopyrite, and the beauty of asterism in sapphires and rubies. Learn how these properties can help identify minerals and understand their behavior.

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Understanding the Unique Properties of Minerals: Magnetism, Taste, Smell, and Optical Phenomena

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  1. Special Properties of Minerals

  2. 1. Magnetism Attracted to iron or other metals. • Magnetite • lodestone

  3. 2. Feel Many minerals have a unique “feel.” • Graphite – greasy • Talc - soapy

  4. 3. Taste Halite has a distinctive salty taste • Also known as “rock salt.”

  5. 4. Smell Sulfur has a distinctive odor: • Match heads • eggs

  6. 5. Striations Rigid, linear textures • pyrite

  7. 6. Double Refraction Decomposition of light into two rays when it passes through a substance • Iceland spar • Calcite

  8. 6. Optical Properties • Iridescence – appearance of the surface of a mineral to change colors • Chalcopyrite – “peacock ore” • Labrodyrite – “Schiller” • Opal

  9. Bad Idea

  10. 6. Optical Properties b. Chatoyancy and Asterism – internal reflection due to the fibrous structure of a mineral i. Sapphires ii. Rubies iii. Cat’ Eye

  11. Asterism

  12. 6. Optical Properties c. Total internal reflection – substance does not allow light to escape, and all of the light is reflected within the mineral. i. ulexilite crystals ii. Fiber optics

  13. Optical Properties Total Internal Reflection

  14. 6. Optical Properties d. Fluorescence – light that is absorbed by a substance and emitted at a longer wavelength and therefore a lower energy. i. calcite ii. fluorite

  15. 6. Optical Properties f. Polarized light - some minerals filter out certain wavelengths of light i. mica

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