The Rockhound’s Quiz 3
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1. How old are the oldest known rocks on Earth?
- 4 billion
- 60 billion
- 1 million
- 5,000 years
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2. Out of the thousands of minerals in the world, how many are considered gems?
- All of them
- Approximately 50
- A few hundred
- Over 1,000
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3. Which mineral is commonly known as table salt?
- Quartz
- Gypsum
- Halite
- Calcite
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4. Illinois’ State Mineral is also used in toothpaste. What is it?
- Limestone
- Fluorite
- Tully Monster
- Pyrite
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5. Which of these stones are organic gems? (Having come from once living plants or animals)
- Jet
- Pearl
- Ivory
- All the above
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6. What is molten rock below the Earth’s surface called?
- Magma
- Lava
- Rock
- Erosion
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7. What is the birthstone for April?
- Diamond
- Ruby
- Agate
- Sapphire
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8. This common mineral is used in electronic devices, including clocks. What is it?
- Calcite
- Quartz
- Corundum
- Apatite
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9. Which rock type is formed through the cementation of smaller pieces of rock?
- Igneous
- Sedimentary
- Metamorphic
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10. What are some characteristics for identifying minerals?
- Hardness
- Luster
- Crystal structure
- All the above
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11. After lots of time, pressure, and heat, you get this kind of rock. What type of rock is this?
- Igneous
- Sedimentary
- Metamorphic
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12. True or False: Agate is a gemstone.
- True
- False
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