Gems & Minerals Quiz
문제와 해설
Q1. What is the hardest natural substance on Earth?
Ruby / Diamond / Sapphire / Quartz
Diamond scores 10 on the Mohs hardness scale, making it the hardest known natural material.
Q2. Which green gemstone is associated with the month of May?
Jade / Peridot / Emerald / Tourmaline
Emerald is May's birthstone. Its green color comes from trace amounts of chromium and vanadium.
Q3. What gives a ruby its red color?
Iron / Copper / Chromium / Manganese
Rubies are a variety of corundum (aluminum oxide). Trace amounts of chromium give them their characteristic red color.
Q4. What color is an amethyst?
Blue / Green / Purple / Yellow
Amethyst is a purple variety of quartz. Its color ranges from light lilac to deep violet.
Q5. Ruby and sapphire are both varieties of which mineral?
Quartz / Corundum / Beryl / Feldspar
Both ruby (red) and sapphire (blue) are varieties of corundum (aluminum oxide), differing only in trace elements.
Q6. Which common mineral makes up most of the sand on beaches?
Feldspar / Calcite / Quartz / Mica
Quartz is the most abundant mineral on Earth's surface. Most beach sand is composed of quartz grains.
Q7. Which gemstone is known for displaying a 'play of color' — shifting rainbow hues?
Moonstone / Opal / Pearl / Alexandrite
Opal's 'play of color' comes from light diffracting through microscopic silica spheres within the stone.
Q8. Turquoise gets its distinctive blue-green color primarily from which element?
Iron / Cobalt / Copper / Nickel
Turquoise is a hydrated copper aluminum phosphate. Copper gives it the blue-green color.
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