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Questions and Answers
What is the streak of a mineral?
What is the streak of a mineral?
- The color of the mineral under UV light
- The color of the mineral when exposed to air
- The color of the powder produced when dragged across a surface (correct)
- The color of the mineral's surface
What is hardness in terms of minerals?
What is hardness in terms of minerals?
- Ability to conduct electricity
- Resistance to scratching (correct)
- Resistance to breaking
- Ability to change shape under pressure
Who created the Mohs scale of hardness?
Who created the Mohs scale of hardness?
- Marie Curie
- Isaac Newton
- Friedrich Mohs (correct)
- Albert Einstein
What is cleavage as related to minerals?
What is cleavage as related to minerals?
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What is fracture in terms of minerals?
What is fracture in terms of minerals?
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What does it mean for a mineral to be inorganic?
What does it mean for a mineral to be inorganic?
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What is the significance of a mineral having a definite chemical composition?
What is the significance of a mineral having a definite chemical composition?
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What causes many minerals to be a variety of colors?
What causes many minerals to be a variety of colors?
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What does the term 'luster' refer to in minerals?
What does the term 'luster' refer to in minerals?
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Study Notes
Mineral Properties
- The streak of a mineral is the color of the powder produced when it is scratched on a porcelain plate.
Hardness
- Hardness is a mineral's resistance to scratching.
- Friedrich Mohs created the Mohs scale of hardness, which ranks minerals from 1 (softest) to 10 (hardest) based on their scratch resistance.
Cleavage and Fracture
- Cleavage refers to the way a mineral breaks along flat surfaces, producing smooth, shiny surfaces.
- Fracture refers to the way a mineral breaks in a more random, uneven pattern.
Composition and Origin
- A mineral is inorganic, meaning it is not derived from living organisms.
- A mineral has a definite chemical composition, which is essential to its identity and properties.
Color and Appearance
- Many minerals exhibit a variety of colors due to the presence of impurities or defects in their crystal structure.
- Luster refers to the way a mineral reflects light, which can range from metallic to glassy to earthy.
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