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Name an igneous rock which is smooth, glassy and used in making jewellery.
- a)Granite
- b)Marble
- c)Obsidian
- d)Shale
- e)None of these
Correct answer is option 'C'. Can you explain this answer?
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Name an igneous rock which is smooth, glassy and used in making jewell...
Answer:
Obsidian is an igneous rock that is smooth and glassy in texture. It is formed when molten lava cools rapidly, preventing the growth of mineral crystals. Obsidian is primarily composed of silica, which gives it its glass-like appearance. This unique texture makes obsidian a popular choice for making jewelry.
Properties of Obsidian:
- Smooth and glassy texture: Obsidian has a smooth and shiny surface due to its rapid cooling. It lacks the visible mineral grains found in other rocks.
- Color: Obsidian can be black, brown, or green, depending on the impurities present in the lava.
- Hardness: Obsidian has a hardness of around 5 to 5.5 on the Mohs scale, which means it is relatively easy to scratch.
- Translucent: Obsidian is often transparent or translucent, allowing light to pass through it.
Uses of Obsidian in Jewelry:
- Gemstone: Due to its unique appearance and texture, obsidian is cut and polished to create gemstones for use in jewelry making. It can be shaped into beads, cabochons, or carved into intricate designs.
- Pendants and necklaces: Obsidian gemstones are commonly used in pendants and necklaces. They can be set in various metal settings or combined with other gemstones for a striking contrast.
- Bracelets and earrings: Obsidian beads are often used in bracelets and earrings. They can be combined with other materials like silver, gold, or other gemstones to create beautiful and unique pieces of jewelry.
Advantages of Using Obsidian in Jewelry:
- Unique appearance: Obsidian's smooth and glassy texture, along with its unique color variations, adds a distinct and eye-catching element to jewelry designs.
- Versatility: Obsidian can be shaped and carved into various forms, making it suitable for different types of jewelry.
- Durability: While obsidian is not as hard as some other gemstones, it is still durable enough to withstand daily wear. However, care should be taken to avoid scratching or chipping the stone.
In conclusion, obsidian is an igneous rock that is smooth, glassy, and commonly used in making jewelry due to its unique appearance and versatility.
Obsidian is an igneous rock that is smooth and glassy in texture. It is formed when molten lava cools rapidly, preventing the growth of mineral crystals. Obsidian is primarily composed of silica, which gives it its glass-like appearance. This unique texture makes obsidian a popular choice for making jewelry.
Properties of Obsidian:
- Smooth and glassy texture: Obsidian has a smooth and shiny surface due to its rapid cooling. It lacks the visible mineral grains found in other rocks.
- Color: Obsidian can be black, brown, or green, depending on the impurities present in the lava.
- Hardness: Obsidian has a hardness of around 5 to 5.5 on the Mohs scale, which means it is relatively easy to scratch.
- Translucent: Obsidian is often transparent or translucent, allowing light to pass through it.
Uses of Obsidian in Jewelry:
- Gemstone: Due to its unique appearance and texture, obsidian is cut and polished to create gemstones for use in jewelry making. It can be shaped into beads, cabochons, or carved into intricate designs.
- Pendants and necklaces: Obsidian gemstones are commonly used in pendants and necklaces. They can be set in various metal settings or combined with other gemstones for a striking contrast.
- Bracelets and earrings: Obsidian beads are often used in bracelets and earrings. They can be combined with other materials like silver, gold, or other gemstones to create beautiful and unique pieces of jewelry.
Advantages of Using Obsidian in Jewelry:
- Unique appearance: Obsidian's smooth and glassy texture, along with its unique color variations, adds a distinct and eye-catching element to jewelry designs.
- Versatility: Obsidian can be shaped and carved into various forms, making it suitable for different types of jewelry.
- Durability: While obsidian is not as hard as some other gemstones, it is still durable enough to withstand daily wear. However, care should be taken to avoid scratching or chipping the stone.
In conclusion, obsidian is an igneous rock that is smooth, glassy, and commonly used in making jewelry due to its unique appearance and versatility.
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Name an igneous rock which is smooth, glassy and used in making jewell...
CORRECT ANSWER IS C
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