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

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

Part 1: Color and streaks of minerals

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 minerals have multiple colors

Some different minerals have the same color

The color of a mineral is sometimes caused by the impurities it contains, not the color of the mineral itself.

The color of a mineral's surface is easily changed by factors such as light, while the streaks of a mineral are fixed.

Although the same mineral can appear in different colors, the color of the streaks must be the same.

Different minerals may have the same color but not necessarily the same streaks.

When identifying minerals, the color of a mineral's streaks is more reliable than the color of the mineral's surface.

Observation and description of minerals PPT, part 2 content: softness and hardness of minerals

How to compare the softness and hardness of wood, metal, and plastic?

We can also first compare which of nails, copper keys (or paper clips), and small steel knives is the softest, which is softer, and which is harder. Then use them as standards for judging softness and hardness to characterize the minerals respectively, so as to know the hardness of the minerals.

mineral hardness

Able to carve marks with fingernails.

Traces cannot be carved with fingernails, but traces can be carved with a copper key (or paper clip).

You cannot use a copper key (or paper clip) to carve out traces, but you can use a knife to carve out traces.

Neither a copper key (or paper clip) nor a knife can be used to carve traces.

The hardest mineral among minerals is graphite, which is an important solid lubricant and is also used to make pencil leads.

Diamond is the hardest mineral and is widely used in grinding, cutting, polishing and other important tools.

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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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