Specification reference: 1.1e To use physical and chemical testing to identify minerals. Aim: Copper coin (pre 1992 coins are Apparatus: 97% copper, post 1992 they are copper plated steel), hardness ~3.5 on Mohs’ scale. Mineral testing equipment: Streak plate/unglazed tile to test the colour of Steel pin/needle (dissecting pin from powdered minerals. Biology department or steel nail), hardness ~5.5 on Mohs’ scale. Dilute hydrochloric 0.5 mol acid (“bench strength” dm−3) in a dropper bottle to test if a mineral is a Learners to also use own fingernail, carbonate. hardness ~2.5 on Mohs’ scale. Method: Carry out the appropriate tests and record results. Complete a table (similar to below) to logically record the results of observations. Description and identification of mineral specimen X Colour Crystal shape Cleavage Fracture Hardness mineral is scratched by mineral is softer than mineral is not scratched by mineral is harder than hardness of mineral is between and on Mohs hardness scale Density Streak Lustre Reaction with cold dilute HCl Conclusion: identification of mineral X
Specification reference: 1.1e Aim: To use physical and chemical testing to identify minerals. Apparatus: Mineral testing equipment: Streak plate/unglazed tile to test the colour of powdered minerals. Dilute hydrochloric acid (“bench strength” 0.5 mol dm−3) in a dropper bottle to test if a mineral is a carbonate. Copper coin (pre 1992 coins are 97% copper, post 1992 they are copper plated steel), hardness ~3.5 on Mohs’ scale. Steel pin/needle (dissecting pin from Biology department or steel nail), hardness ~5.5 on Mohs’ scale. Learners to also use own fingernail, hardness ~2.5 on Mohs’ scale. Method: Carry out the appropriate tests and record results. Complete a table (similar to below) to logically record the results of observations. Description and identification of mineral specimen X Colour Crystal shape Cleavage Fracture Hardness mineral is scratched by mineral is softer than mineral is not scratched by mineral is harder than hardness of mineral is between and on Mohs hardness scale Density Streak Lustre Reaction with cold dilute HCl Conclusion: identification of mineral X
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