50.8 MB (5.9 MB compressed)
5169 x 3435 pixels
43.7 x 29.0 cm ⏐ 17.2 x 11.4 in (300dpi)
TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Sphalerite 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. Sphalerite has a brownish white or pale yellow streak. It is a mineral composed of zinc sulphide (ZnS). It is the main ore of zinc.
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