Chemistry, 01.04.2021 18:10 powella033
For the majority of minerals, the streak obtained when the mineral is scratched against a porcelain plate is a. only useful if the mineral is softer than the porcelain streak plate. b. always dark brown or black. c. always diagnostic of that mineral. d. not useful, because the porcelain will often chemically react with the mineral.
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For the majority of minerals, the streak obtained when the mineral is scratched against a porcelain...
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