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Interstitials are line defects none of these surface defects point defects Grain boundaries are none of these point defects surface defects line defects In an interstitial solid solution, the solute atoms occupy vacancy sites interstitial sites the crystal structure changes normal solute atom sites Solution 1) ans : D an atom that occupies a place outside the normal lattice position. It may be the same type of atom as the others (self interstitial) or an impurity interstitial atom. 2) ans :C Polycrystalline material comprised of many small crystals or grains. The grains have different crystallographic orientation.There exist atomic mismatch within the regions where grains meet. These regions are called grain boundaries. 3) ans : B In interstitial solid solution solute atoms occupy interstitial sites. ..

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1. Which of the following is the definition for mineral ? a Any naturally-occurring chemical compound that does not contain carbon and has a crystalline structure. b A naturally occurring geologic material that is an inorganic, crystalline solid and has a definite chemical composition. c Inorganic, solid, naturally occurring chemical compounds that do not contain carbon. d A pure, solid, chemical substance formed by natural processes. 2. Your book states that crystals are...crystalline material. That's kinda like saying water is made of water molecules. Which of the following is the best summary of what a crystal is, based upon the discussion in the book? a Atoms bonded together to form a solid, rigid material with a definite shape. b Atoms arranged into a closely-packed structure. The crystal shape depends on the packing arrangement. c Atoms bonded together in a repeating, 3-dimensional geometric pattern. The shape depends on the elements that are bonded together. d None of these defines what a crystal is. 3. Which of the following best describes what mineral cleavage is? a Zones of weakness in a mineral where crystal growth was interrupted. b Zones of weakness along crystal growth lines. c Irregular breaks in a crystal. d Planes of weakness in a crystal lattice caused by the alignment of chemical bonds. 4. Select all of the ways a mineral can form: Select 5 correct answer(s) a boiling liquid b diffusion within a solid c freezing liquid d pressure crystallization e crystallized by an organism f sublimation from a gas g precipitation from a liquid 5. Minerals can be dissolved in a liquid. This is called: a a compound. b a solute. c a mixture. d a solution. 6. Minerals precipitate from a solution when: a The solvent becomes oversaturated with the solute. b The solution becomes oversaturated with solvent. c The solvent is undersaturated. d The solute is undersaturated in the solvent. 7. Your text discusses anhedral vs. euhedral crystals. Considering this, which of the following would be a true (and useful) fact about crystal shapes in a rock? a Spaces between large euhedral crystals filled with anhedral crystals = anhedral crystals formed from the last remaining liquid. b All are possible! c Large anhedral crystals overgrown with smaller euhedral crystals = anhedral crystals formed first and were probably once euhedral. d Euhedral crystals surrounded by anhedral crystals = euhedral crystals formed first. 8. Mineral hardness is measured on Mohs hardness scale. A mineral with a hardness of 6 can: a scratch any mineral with a hardness of 7, 8, 9, or 10. b only be scratched by a mineral with a hardness of 10. c be scratched by any mineral with hardness of 5, 4, 3, 2, or 1. d scratch any mineral with hardness of 5, 4, 3, 2, or 1. 9. Which physical property is the least reliable for identifying a mineral? a Color- because color can vary if there are elements substituting places in the mineral's crystal lattice. b Crystal shape- because minerals can h.

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