luster hematite may vary in color but the streak will always be reddish brown

17
Starter: What is the density of a cube with a side length of 3 cm and a mass of 27 grams? Volume= length x width x height Density= Mass/volume

Upload: paul-price

Post on 19-Jan-2016

222 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Luster Hematite may vary in color but the streak will always be reddish brown

Starter:

What is the density of a cube with a side length of 3 cm and a mass of 27 grams?

Volume= length x width x height

Density= Mass/volume

Page 2: Luster Hematite may vary in color but the streak will always be reddish brown

Minerals

Page 3: Luster Hematite may vary in color but the streak will always be reddish brown

Minerals: From the Inside OutMinerals are the building blocks that make up rocks

There are about 3000 known minerals.

Page 4: Luster Hematite may vary in color but the streak will always be reddish brown

Answer These Questions To be a mineral, all of the following questions must be

answered “yes”:

1. Is it nonliving material? A mineral is inorganic.

2. Is it formed in nature? Only naturally made crystals are classified as minerals.

3. Does it have a crystalline structure (repeating inner structure that determines shape)?

4. Is it a solid? No gases or liquids allowed.

Page 5: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals

Color

• Impurities can change color

• Air and water can also change color of mineral

Page 6: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals (cont.)Luster

• How the surface of a mineral reflects light.

• Controlled by how atoms are bonded

• Metallic, submetallic, nonmetallic (vitreous, silky, resinous, waxy, pearly, earthy)

Page 7: Luster Hematite may vary in color but the streak will always be reddish brown

Luster

Page 8: Luster Hematite may vary in color but the streak will always be reddish brown

Luster

Page 9: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals (cont.)Streak

• Color of mineral in powdered form

• Not always the same as color of mineral sample

• More reliable than color of mineral

Hematite may vary in color but the streak will always be reddish brown.

Page 10: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals (cont.)Cleavage and Fracture

• How mineral breaks, determined by atomic arrangement

Cleavage – tendency to break along flat surfaces (mica, halite) because bonding is weakest in those directions.

Fracture – tendency to break along curved or irregular surfaces (quartz – conchoidal) when bonding is equally strong in all directions.

Page 11: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals (cont.)Hardness

• Resistance to being scratched

• Mohs hardness scale:

Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase, Quartz, Topaz, Corundum, Diamond

Page 12: Luster Hematite may vary in color but the streak will always be reddish brown
Page 13: Luster Hematite may vary in color but the streak will always be reddish brown

Hardness Scratch Test

< 2.5 = Mineral marks paper

2.5 = Fingernail

3 = Copper Penny

5 = Steel knife blade

6 = Plate of glass

6.5 = Steel file

Page 14: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals (cont.)Density

• How much matter there is in a given amount of space (D = m/v) (g/ cm³)

Page 15: Luster Hematite may vary in color but the streak will always be reddish brown

Study Jams Mineral Slideshow

Click the link below. Watch the slideshow. When you are done with the slideshow you will take the quiz. You will answer the quiz on the computer and on your handout.

http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/minerals.htm

Page 16: Luster Hematite may vary in color but the streak will always be reddish brown

Identifying Minerals Video

Click the link below. Watch the video. When you are done you will write down two things you learned and one thing you still have questions about on your handout.

https://www.youtube.com/watch?v=32NG9aeZ7_c