Lab2_Exercise1_DataSheet

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Geology

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Apr 29, 2024

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docx

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EXERCISE 1 DATA SHEET Table 4. Mineral Identification Mineral Sample Color/ Clarity Luster Streak Hardness Cleavage Other Distinctive Properties Name of Mineral A Colorless, white, (may occur in all colors)/ transparen t to translucent Vitreous to greasy White 7 Conchoida l fracture Scratches glass Quartz B Gold Metallic Greenish black 6 – 6.5 Uneven fracture Cubic, octahedral Pyrite C D Colorless, white, yellow, brown, pink/ transparen t to translucent Vitreous to iridescent White 3 Three not at 90° Effervesces in acid when powdered Calcite E Colorless, yellow, brown/ transparen t to translucent Vitreous White 2-2.5 One (perfect) Easily splits into thin sheets Muscovite F White, pink, orange, brown/ Vitreous White 6 Two at 90° Frequently twinned Potassium Feldspar ©eScience Labs, 2016
opaque G Colorless, white, gray/ transpare nt to transluce nt Vitreous or silky White 2 One (perfect) Sometimes fluorescent in ultraviolet light Gypsum H Dark brown, transluce nt Vitreous Grey- brown Less than 6 One perfect Split into thin sheet Biotite I Colorless, white, gray/ opaque Vitreous; may be iridescent White 6 Two at 90 Commonly shows fine, parallel striations Plagioclase Feldspar 1. What properties of Mineral B could be used to distinguish it from gold? Write the name of Mineral B, its common nickname (see Figure 4) and fill in the data about each of the properties. Compare the differences between the two minerals and summarize your findings in a short paragraph. Is the nickname accurate? Why or why not? 1a. The differences between native gold and Iron pyrite is the streak, with pyrite being a greenish black and gold being yellow, the hardness, the cleavage, and the specific gravity. Pyrite is harder, being between 6 and 6.5 compared to golds 2.5 – 3. The cleavage is also ©eScience Labs, 2016
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