LAB 4 WORKSHEET - Final

Lab 4 Worksheet - Mineral Properties and Identification Mineral Properties Worksheet Sample Color Luster Note if luster is metallic or nonmetallic or nonmetallic. If non-metallic, make further descriptive notes on the luster Note Hardness based on Mohs Scale Streak Use the porcelain plate to determine the streak color. NOTE: if no powder is created, note “no streak” Cleavage or fracture Note if sample displays distinct planes of breakage (cleavage) or just has an irregularly broken surface (fracture) Other Diagnostic Properties Note if there is a presence of a sulfur odor, magnetism, striations on crystal faces, or reaction to weak acid (vinegar) Name of Mineral Use the Mineral Key to determine the name of the mineral VERY SOFT (< 2.5) - it can be scratched by fingernail SOFT (+/- 3) - it is harder than a fingernail but can be scratched by copper plate SOFT-MEDIUM (+/- 4) - it is harder than copper plate but can be scratched by steel nail MEDIUM (4-5.5) - it is harder than the steel nail but not hard enough to scratch glass plate HARD (> 5.5) – it cannot be scratched by the steel nail but can scratch the glass plate 10 White, Transparent Non N N N N Y No streak Fracture No smell, Clean surface Quartz Crystal 11 Gold Metallic N N N N Y Gold streak Fracture No smell Pyrite 12 Green Non N N N N Y No streak Fracture Rough Talc 13 Black Metallic N N Y N N Brown Streak Cleavage No smell sphalerite 14 Grey Metallic Y N N N N Gray streak Fracture Leaves marks on surfaces Graphite 15 Black Non N Y N N N No streak Fracture Magnetic Magnetite 16 Transparent Non N N N Y N No streak Cleavage Translucent Muscovite Mica 17 Black Non N Y N N N No streak Cleavage Thin/ fragile Biotite Mica 18 Black Non N N N N Y No streak Cleavage Magnetic Galena Page 2 of 2 BC Online – Physical Geology Lab (GLY1010L)