Results of the Streak Test

Describing the Colors of Minerals

Our class did a streak test on minerals to see their true color. We had to wear gloves while handeling the minerals because it could irritate our skin. We worked in groups of two. We tested about 12 minerals with one black and one white tile. One of the green and white minerals turned out black on the white block. We could not touch the minerals. One mineral appeared completely white but when scratched appeared black. All of us wrote what the streak color was in our journals. Some minerals kind of surprised us because of how the streak color turned out.

Discovering Minerals

Our most recent science lesson, from Rocks and Minerals Unit, was called "Discovering Minerals". Our science groups were given three minerals, feldspar, quartz, and galena.



We used our magnifing classes to look at each mineral and then we wrote notes describing what we saw.

Next, we looked at our twelve rock samples and predicted which rocks might have tiny pieces of these minerals in them.

Galena Mineral Prediction

The following number of students from our class think that the mineral Galena is in the following rocks. # of students / groups:

• Granite 2
• Gneiss 3
• Limestone 1
• Shale 1
• Sandstone 1
• Obsidian 1
• Basalt 1
• Slate 2
• Marble 2
• Schist 3

Feldspar Mineral Predictions

The following number of students from room 206 at Pennell think that the mineral Feldspar is in the following rocks.

6 students/groups think feldspar is in granite.

1 student/group think feldspar is in gneiss.

1 student/group think feldspar is in conglomerate.

1 student/group think feldspar is in shale.

Quartz Mineral Prediction

My classmates and I think that the mineral quartz is in the following rocks:

1 student/group think quartz is in limestone.

5 students/groups think quartz is in obsidian.

1 student / group think quartz is in pumice.

7 students / groups think quartz is in marble.

2 students/ groups think quartz

After more investigation, we will let you know how close our predictions were.