"Observing and describing minerals (1)" Rocks and minerals PPT download

Description

"Observing and describing minerals (1)" Rocks and minerals PPT download

Part One: Importing New Knowledge

Thinking: When observing these two minerals, from what aspects do you observe them?

◆We can observe the color of minerals;

◆Observe mineral streaks;

◆Observe the softness and hardness of minerals;

There are so many methods for students. Today we will learn how to observe minerals - "Observe and Describe Minerals".

Observation and description of minerals PPT, part 2: new knowledge explanation

Mineral color and streaks

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, some have multiple colors, and some have the same color across different minerals. Many minerals are named after their colors, such as hematite is red, limonite is brown, chalcopyrite is yellow, and scheelite is off-white.

Observation and description of minerals PPT, part three: scientific experiment exploration

Observe the color of minerals and streaks

Purpose of the experiment: To observe the color of mineral streaks on a white unglazed porcelain plate after the ore is rubbed on the porcelain plate.

Experimental materials: natural gold, pyrite, chalcopyrite, galena, graphite, quartz, hematite, unglazed porcelain plates, hard paper, carbon brushes.

Note: During the experiment, be sure to mark the scratches of different minerals with their names on the hard paper.

Which color do you think is more reliable when identifying minerals? Tell us why!

The color of mineral streaks is more reliable. Because the color of the streaks is the color of the powder left by the mineral on the porcelain plate, it is the color of the mineral itself. The stripe color can eliminate the influence of impurities and other external factors.

Observation and description of minerals PPT, part 4: knowledge expansion

The hardest mineral is diamond, which is widely used in important tools such as grinding, cutting, and polishing. The hardest mineral is graphite, which is an important solid lubricant and is also used to make pencil leads. Identifying the hardness of minerals is of great interest in industries such as architecture, jewelry, and sculpture.

Diamond is commonly known as "diamond". That is what we often call diamond. It is a mineral composed of carbon. It is a particle material composed of elemental elements in nature. It is a carbon allotrope (diamond, graphene, fullerene, carbon nanoparticles). tube, Lonsdale stone, etc.). Graphite can form artificial diamond under high temperature and pressure, which is also a precious gemstone. China also has the technology to make diamonds.

Observation and description of minerals PPT, Part 5: Consolidation and improvement

Discuss your knowledge of minerals with your classmates? Let’s talk about it together.

1. Divide into groups: 4 people together;

2. Discuss within the group and write down the results of the discussion;

3. Representatives from the group speak.

Graphite is soft and dark gray; it has a greasy feel and can pollute the paper. The hardness is 1 to 2, and the hardness can increase to 3 to 5 along the vertical direction with the increase of impurities. When isolated from oxygen, its melting point is above 3000°C, making it one of the most temperature-resistant minerals. It can conduct electricity and heat. Graphite, diamond, carbon 60, carbon nanotubes, graphene, etc. are all simple substances of the carbon element, and they are allotropes of each other.

Observation and description of minerals PPT, Part 6 content: Class summary

1. Many minerals are named after their colors.

2. Some minerals have multiple colors.

3. Some different minerals have the same color.

4. The color of mineral streaks is more reliable than the surface color.

5. There are two ways to identify the hardness of minerals: scoring each other and using tools to score.

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For more information about the "Rocks and Minerals Observation and Description of Minerals" PPT courseware, please click on the Rocks and Minerals ppt Observation and Description of Minerals ppt tag.

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Update Time: 2024-09-30

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