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Title: Feldspar streak test
Caption: Feldspar 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. Feldspar has a white streak. It is a tectosilicate mineral. Feldspar is defined to have hardness of 6 in the Mohs scale.
Credit: Album / Turtle Rock Scientific/Science Source
Image size: 5164 × 3440 px | 50.8 MB
Print size: 43.7 × 29.1 cm | 2033.1 × 1354.3 in (300 dpi)