GEO 2163 Lecture 7: Elements and sulphides
22 Dec 2015
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Document Summary
Graphite: this sample had a silver grey colour with a semi metallic luster. It left a dark grey streak on the porcelain plate. It was very soft to the touch, easily scratched by the finger nail. It had formed in foliated masses or layered sheets. It was lemon yellow coloured with a white- pale yellow streak. It had a strong smell to it, imperfect cleavage, and very soft texture to it. Easily scratched with finger nail to say the least. Pyrite: a bright golden sample with metallic gold luster/colour with a green-black streak. No reaction to acid and no magnetic properties. Galena: this sample had a silver lead gray colour with a shiny metallic luster. High density makes this sample particularly heavy as well. Left a dark grey streak on the porcelain plate. Sphalerite: this sample had an earthy/brown colour with a resinous to submetallic luster. It had a light brown streak and was easily scratched by the metal nail.
