關於自然mineral的問題

以下有十個問題,是 ture or false~請問有人可以幫我解釋一下是什麼意思嘛?!謝謝 1.the atoms of a mineral always have the same internal pattern. 2.all crystals are perfect. 3.gems are the result of the addition of trace elements to minerals. 4.minerals are found with one of six possible crystal structures. 5.silicates make up the largest group... show more 以下有十個問題,是 ture or false~請問有人可以幫我解釋一下是什麼意思嘛?!謝謝
1.the atoms of a mineral always have the same internal pattern.
2.all crystals are perfect.
3.gems are the result of the addition of trace elements to minerals.
4.minerals are found with one of six possible crystal structures.
5.silicates make up the largest group of minerals.
6.rare and highly prized minerals are referred to as agates.
7.a minerals with a hardness of nine can easily be identified with a streak test.
8.talc can be easily by its hardness.
9. a diamond leaves a silvery streak when tested on the streak plate
10. a tile is used in a streak test
3 answers 3