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 ...

A streak is useful in distinguishing two minerals with the same color but different streak. A good example is distinguishng Gold (yellow streak), and Chalcopyrite (black streak). Most light colored, non-metallic minerals have a white or colorless streak, as do most silicates , carbonates , and most transparent minerals.

2019年5月2日 · A mineral's streak is the color it has when ground to a powder. Some minerals that occur in a range of colors always have the same streak. As a result, streak is considered a more stable indicator than the color of the solid rock. While most minerals have a white streak, a few well-known minerals can be identified by the color of their streak.

The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface, typically a piece of unglazed porcelain known as a "streak plate." Unlike the mineral's surface color, which can vary due to weathering or impurities, the streak reveals the true inherent color of the mineral in its powdered form.

The streak of a mineral is the color it displays in finely powdered form. The streak maybe completely different from the color of the hand specimen. One of the simplest ways of determining the streak of a mineral is to rub a specimen across a piece of unglazed porcelain known as a …

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.

Streak Definition. The colour of a mineral when powdered and observed against an unglazed white porcelain plate. Test. Rub the mineral across an unglazed white porcelain plate and describe the colour of the powder left on the plate, i.e. the streak.

The streak (also called powder color) 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 ...

Streak is simply the color of a mineral powder. Many minerals have a different color when powdered than they do in crystal or massive forms. The color may be entirely different, or it may be a different shade. Quite a few minerals give a powder streak that is lighter in color than the whole crystal or massive pieces.

streak, the colour of a mineral in its powdered form. It is usually obtained by rubbing the mineral on a hard, white surface, such as a tile of unglazed porcelain, so as to yield a line, or streak, of fine powder. The colour of the streak is usually constant for a given species of mineral, even though the mineral may vary considerably in colour ...