With respect to minerals, which of the following is TRUE?
A) All minerals have probably been discovered
B) Over 500,000 minerals exist
C) "Mineral" is a synonym for "rock"
D) All minerals crystals are too small to be seen
E) Fewer than 20 minerals make up 95% of the crust

Question

Quizplus · Accepted Answer

Out of the given options, E is the only true statement. It is estimated that fewer than 20 minerals make up 95% of the Earth's crust, including minerals such as quartz, feldspar, and mica. Option A is false since new minerals are being discovered all the time, and option B is an overestimate as there are around 5,000 known minerals. Option C is also false since rocks are made up of one or more minerals, but minerals are not synonymous with rocks. Option D is false since many mineral crystals can be seen with the naked eye, such as quartz and garnet.

With Respect to Minerals, Which of the Following Is TRUE