Answer:
Streak is a more reliable property than color because streak does not vary. Minerals that are the same color may have a different colored streak. Many minerals, such as the quartz in the Figure above, do not have streak. ... The streak of hematite across an unglazed porcelain plate is red-brown. Malachite (MAL-uh-KYT), an ore of copper, is green. Color, however, is the least useful property for mineral identification. One reason is that many minerals have similar colors. ... Another reason not to rely on color alone is that some minerals can change color in various circumstances.
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