What is the starting material for igneous gem formation?

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Study for the DCA Gemology Test. Utilize flashcards and multiple-choice questions, each question offering hints and explanations. Prepare effectively for your exam with confidence!

Multiple Choice

What is the starting material for igneous gem formation?

Explanation:
Igneous gem formation starts with molten rock material. When rock melts, magma forms; as that magma cools, it crystallizes into solid minerals. Those crystals can grow into gemstone-quality forms if the cooling is just right and the chemistry permits their development. Sedimentary layers come from deposited sediments; metamorphic rocks arise from existing rocks altered by heat and pressure; volcanic ash is erupted debris, not the melt that crystallizes into gemstones. So the starting material is melted rock material.

Igneous gem formation starts with molten rock material. When rock melts, magma forms; as that magma cools, it crystallizes into solid minerals. Those crystals can grow into gemstone-quality forms if the cooling is just right and the chemistry permits their development. Sedimentary layers come from deposited sediments; metamorphic rocks arise from existing rocks altered by heat and pressure; volcanic ash is erupted debris, not the melt that crystallizes into gemstones. So the starting material is melted rock material.

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