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The streak of a mineral is the color of the powder produced when it is dragged across an unweathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral ...
The streak test is an easy way to determine the color of a mineral in powdered form. It is done by scraping a specimen of that mineral across an unglazed piece of porcelain known as a streak plate.
Diagnostic tool: For minerals with variable colors, the streak can be a key distinguishing feature. For example, both pyrite and chalcopyrite can appear yellow or brown, but pyrite has a black streak, while chalcopyrite has a greenish-black streak.
2 Μαΐ 2019 · While most minerals have a white streak, a few well-known minerals can be identified by the color of their streak. The simplest way to make a powder from a mineral sample is to grind the mineral on a small rectangular piece of unglazed ceramic called a streak plate.
Describe how color, luster, and streak are used to identify minerals. Explain how the hardness of a mineral is measured. Identify additional properties that can be used to identify some minerals.
Streak is the color of a mineral’s powder. 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 3, do not have streak. To check streak, scrape the mineral across an unglazed porcelain plate (Figure 5).
Streak is the color of a mineral’s powder. 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. To check streak, scrape the mineral across an unglazed porcelain plate (Figure below).
