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Authoritative PPT Summary
"Observing and describing minerals (2)" Rocks and minerals PPT download
Part One: Importing New Knowledge
In what ways do we already know how to observe and describe minerals?
mineral color
mineral streaks
mineral hardness
Let’s learn a few more ways to observe and describe minerals
transparency gloss shape
Rocks and Minerals PPT, Part 2: New Knowledge Explanation
1. Observe and describe the transparency of paper
Thinking: Do these types of papers have the same light transmittance? What methods can you use to verify this? How to describe the transparency of these papers?
Across these three kinds of paper, observe the words under the paper; shine a flashlight; face the sun, etc.
transparency
Measures the transparency of a mineral by looking at the edges of the mineral fragments to see if other objects are visible
Divided into: transparent, translucent, opaque
luster
Reflections on mineral surfaces create a sheen
Divided into: metallic luster, semi-metallic luster, non-metallic luster
Rocks and Minerals PPT, Part 3: Knowledge Expansion
Non-metallic luster
Silk luster (like silk fabric shining)
Earthy luster (the surface is dimly reflective like dirt)
Waxy luster (like the glow given off by a candle)
Vitreous luster (glass-like luster)
Greasey shine (like smeared with fat)
Pearl luster (like the luster given off by pearls)
Rocks and Minerals PPT, Part 4: Consolidation Exercises
1. We can observe and describe minerals through ( ) ( ) ( ) ( ) ( ) ( ) and other aspects.
2. Measure the quality of minerals by observing whether other objects can be seen on the edges of mineral fragments ( )
3. The reflection on the mineral surface forms ( )
True or false
(1) Quartz has a luster like glass. ( )
(2) Some minerals are highly reflective, while others are weakly reflective. ( )
(3) Calcite, quartz, etc. have special geometric shapes and are mineral crystals. ( )
(4) Those with metallic luster must be metallic minerals. ( )
(5) Mica has metallic luster. ( )
Rocks and Minerals PPT, Part 5: Class Summary
What did you learn in this lesson?
1. Through study, I also know that minerals can be described in terms of transparency, luster, and shape.
2. I know that the transparency of minerals is divided into transparent, translucent, and opaque
3. Through study, I know the types of mineral luster
4. Through study I know the shape types of minerals
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