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streak
(redirected from Angioid streaks)

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streak

Colour of a mineral in its powdered form, usually obtained by rubbing the mineral on a hard, white surface (e.g., a tile of unglazed porcelain) to yield a streak of fine powder. The streak's colour is usually constant for a given mineral, even if the mineral varies in colour as it occurs in the field or if the streak is different from the colour of the unpowdered mineral. Streak is diagnostically useful because it may distinguish between mineral species that are otherwise similar in appearance.

streak
1. 
a. (of lightning) a sudden flash
b. (as modifier): streak lightning
2. Mineralogy the powdery mark made by a mineral when rubbed on a hard or rough surface: its colour is an important distinguishing characteristic
streak [strēk]
(mineralogy)
The color of a powdered mineral, obtained by rubbing the mineral on a streak plate.
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Opthalmologic examination showed bilateral colloid bodies and peripapillary atrophy with angioid streaks.
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There are several other conditions that occur in relatively young patients, such as Ocular Histoplasmosis and Angioid Streaks, in which breaks in Bruch's membrane occur and are complicated by subfoveal choroidal neovascularization.
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