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Published byAlexia Georgina Jennings Modified over 9 years ago
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#23 Specific Gravity Lab #2 Winter 2007 Note : Linda …this assignment is a “back up assignment ---and is essentially an extension of the first Specific Gravity Lab. I want you to assign this if you feel the great majority of students are done with the 3 other labs ---- and if some “filler” is needed. Formula for Specific Gravity : mass of sample in air / loss of weight in water
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Specific Gravity Lab I. TITLE II. PURPOSE : to identify the specific gravity of minerals and determine which of the mineral groups (silicates, carbonates,oxides, sulfates and sulfides, halides ) has the highest specific gravity. III. PROCEDURE : use the process for determining Specific gravity for the minerals indicated
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Place mineral in water and weigh Allow mineral to hang in air from spring scale and determine mass in grams
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Make a loop of string to suspend mineral from hook on spring scale Prepare a slip knot to hold one end of string on scale …and the other end on the mineral. Experiment to find the a knot that will hold.
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Specific Gravity Formula Specific Gravity Use these formulae: Density = mass / volume Volume = mass / density
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MineralMass On scale (g) Volume (cm3) determined by displacement Density mass/ volume (g/cm3) Weight in air (g) Weight in H20 (g) Specific gravity (dimension -less) Halite Quartz Iron Pyrite Hornblende Augite sphalerite Hematite Cassiterite
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Mineral Mineral group s– name the group that the mineral belongs to ) (silicate, carbonate, oxide, sulfate and sulfide, halides, or native elements) Halite Quartz Iron Pyrite Hornblend e Augite sphalerite Hematite Cassiterite
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Specific Gravity Graphs: Label all graphs…and all graphs must be full page Specific Gravity Minerals Density g/cm3
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