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Talc streak test

Talc streak test

C044/0267

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50.8 MB (5.8 MB compressed)

5167 x 3439 pixels

43.7 x 29.2 cm ⏐ 17.2 x 11.5 in (300dpi)

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Credit

TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY

Caption

Talc streak test. The streak test is used to determine the colour of a mineral in powdered form. It is done by scraping a specimen across a piece of unglazed porcelain known as a streak plate. Talc has a white or pale green streak. It is a clay mineral composed of hydrated magnesium silicate (H2Mg3(SiO3)4). Talc is defined to have hardness of 1 in the Mohs scale.

Release details

Model release not required. Property release not required.

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