Editing Internet Texts/Gemstones/Basic properties of gemstones

Choose the correct answer



{ 1. What is the hardness of agate according to Mohs' scale? - 6 + 7 - 8 - 9
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{ 2. What color is the streak of emerald? - Dark green - Light brown - Light green + White
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{ 3. What is the lustre of benitoite? - Dull - Greasy + Glassy - Silky
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{ 4. What class does spinel belong to? + Oxides - Phosphates - Organic - Silicates
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{ 5. What is the crystal system of aquamarine? - Trigonal + Hexagonal - Rhombic - Cubic
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