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"Understanding Several Common Rocks" Rocks and Minerals PPT Courseware
Kind tips:
1. Dilute hydrochloric acid is very corrosive. During the experiment, do not put the rock on the table and drop it directly. The rock should be placed in a dish;
2. Gently pinch the dropper and the dilute hydrochloric acid will be sucked up. Use the dropper to drop 1 drop on each rock. After the drop is completed, immediately put the dropper back into the dropper bottle and carefully observe the reaction;
3. For rocks that have been dripped with dilute hydrochloric acid, use tweezers to hold the rocks, wash them in clean water, and then dry them with a towel. If you accidentally drop dilute hydrochloric acid on your hands, please wash them with water immediately;
4. After each group of students gets the materials, they choose at least 4 rocks for observation. Before observing, fill in the rock number of your choice on the record sheet;
5. It is recommended that everyone do the experiment of dropping hydrochloric acid after all other observation activities are over;
6. The recorder records the observation results in a timely manner. After the experiment, he organizes the experimental materials and puts the record sheet in the middle of the table.
Information introduction to reading rocks p68
Granite: mottled, composed of black, white, flesh-red or colorless transparent particles
The particles are coarse, rough and very hard.
Conglomerate: Looks like concrete and is made up of gravel or pebbles and is rough and hard.
Limestone: bluish gray, gray or slightly yellow, fine particles, smooth, hard, often
There are fossils that bubble when exposed to hydrochloric acid.
Sandstone: There are many colors such as red, earthy yellow, gray, etc., and it looks like many different thicknesses.
Lots of sand stuck together, rough and hard.
Shale: comes in various colors such as gray, black, red, brown, yellow, etc., with fine particles and soft texture.
It is relatively smooth, thinly layered, and often contains fossils.
Slate: gray, green, etc., easy to separate into layers, fine particles, tight structure,
It is relatively smooth, hard, and has a crisp sound when struck.
Marble: pure white, black, etc., often with beautiful stripes, coarse particles, relatively
Rough, crystal clear, dense, soft, bubbling when exposed to hydrochloric acid.
You can classify rocks according to their origin!
Read unit database p81 "The Origin and Classification of Rocks" and classify the rocks observed today according to their origin.
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