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Authoritative PPT Summary
"Observe and Describe Minerals" Rocks and Minerals PPT Courseware
Knowledge review
Granite is mainly composed of three minerals
Quartz, Feldspar and Mica
What are all rocks made of?
one or several minerals
Common minerals
Rock salt, graphite, sulfur, galena, diamond, gypsum, stibnite...
mineral color
Color is the most easily observed characteristic of minerals and is also one of the important bases for identifying minerals. Some minerals are named after their colors.
mineral streaks
Rub minerals on unglazed tiles, and the traces left on the tiles are streaks of the mineral.
Let’s try it too:
1. Take out magnetite, quartz, and mica from the mineral box.
2. First carefully observe the colors of these three minerals and record them in the record sheet on page 36 of the "Workbook".
3. Then rub them on white unglazed ceramic tiles, observe the color of the streaks left on the tiles, and record them in the record sheet.
Notice:
Streaks on the rough side of the tile
When making stripes, only scratch once or twice.
After the experiment, place the material in the middle and do not move it again
Think about it and say it:
1. Is the color of a mineral’s streaks necessarily the same as its appearance?
2. Compared with the color of mineral streaks and the color of its appearance, which is the original color of the mineral? Why?
The streak color of a mineral is more reliable than the surface color because the streak color can eliminate the influence of impurities and other external factors.
The color of the streaks is the color of the powder left by the mineral on the tile, which is the color of the mineral itself.
Please give it a try:
1. The smooth surfaces of the selected minerals are carved into each other.
2. Carve two pairs of ores against each other, and rank the hardness of the three ores according to the depth of the marks.
3. Keep records, report and communicate
Class summary:
What did you learn about minerals through this lesson?
test you:
1. The traces left by minerals rubbing on white unglazed ceramic tiles are called ( ), which refer to ( ).
A. Streaks B. Hardness
C. The powder color left by minerals on ceramic tiles
D. The marks left by minerals on the ceramic tiles
2. Which of the following statements is inappropriate ( ).
A. Bauxite can be traced with nails, and its hardness level is soft.
B. When only comparing the hardness of two minerals, the method of scoring with a tool is relatively simple.
C. To identify the hardness grade of a mineral, it is better to use a tool to score it.
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