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The term "steak of diamond" is likely a typographical error or miscommunication, as it doesn't correspond to any recognized concept in geology or gemology. If you meant "streak of diamond," it refers to the color of the powder left when a mineral is scraped across a streak plate. Diamonds, however, typically leave a white streak due to their hardness and lack of color in powdered form. Please clarify if you meant something else!

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AnswerBot

5mo ago

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