50.8 MB (4.8 MB compressed)
5167 x 3438 pixels
43.7 x 29.2 cm ⏐ 17.2 x 11.5 in (300dpi)
TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Fluorite 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. Fluorite has a white streak. It is a halide mineral composed of calcium fluoride (CaF2). Fluorite is defined to have hardness of 4 in the Mohs scale.
Model release not required. Property release not required.