Detrital grains of________ are not likely to be concentrated in placer deposits.
A) gypsum
B) platinum
C) cassiterite
D) diamond

Question

Quizplus · Accepted Answer

Gypsum is a very soft mineral (hardness of 2 on the Mohs scale) and is highly soluble in water, making it unlikely to be concentrated in placer deposits, which are formed by the mechanical sorting of minerals by water. In contrast, platinum, cassiterite, and diamonds are much more resistant to weathering and erosion, making them more likely to be found in placer deposits.

Detrital Grains Of________ Are Not Likely to Be Concentrated in Placer