Identify the following rocks using the Key provided.  Place the names with the appropriate number.

Basalt, Breccia, Chert, Conglomerate, Coquina, Diorite, Fossiliferous Limestone, Garnet schist, Gneiss, Granite, Marble, Obsidian, Oolitic Limestone, Petrified Wood, Phyllite, Pumice, Rhyolite, Sandstone, Scoria, Shale, Slate

1. Pumice

The rock is light in color, porous and its grains are not obvious.

2. Diorite

Quartz which is an irregular, glassy grains are absent. However, grains are obvious. The rock has the same amount of light colored minerals as dark colored ones.

3. Shale

Grains are not visible and the rock is smooth and thinly bedded. Also, the rock is brown in color.

4. Oolitic Limestone

Grains are visible but not large. It reacts to acid.

5. Coquina

The grains in the rock are visible, large and shell like. Similarly, the fossils in the rock are embedded in very little matrix.

6. Petrified Wood

The rock has no visible grains and also it has a characteristic of wood preserved.

7. Gneiss

The rock has thick bands present. The grains are visible and they align in bands.

8. Conglomerate

Grains are visible, large and rounded. Also, the grains do not form shell.

9. Rhyolite

The grains are not obvious and they are fine. The rock is peachy-pink in color and only the crystals that are visible are very small.

10. Chert

The rock is very smooth and it is angular in nature. The grains are not visible.

11. Scoria

The rock is porous, dark in color and the grains are not visible.

12. Marble

The rock is granular and the grains are visible. It forms effervescences in acid.

13. Breccia

Grains are visible, large and angular. Similarly, the rock is cemented together.

14. Slate

It is dark colored and flat both on top and bottom. Grains are not visible.

15. Fossiliferous Limestone

The grains are visible, large and shell like. However, it is different from conquina since fossils are embedded in considerable matrix.

16. Sandstone

Grains are visible but not large. The rock does not react with acid.

17. Granite

Grains of the rock are large. It has peachy-pink grains of orthoclase. Also, the rock has transparent grans of quartz.

18. Phyllite

It has fine but visible grains. The rock lacks banding.

19. Garnet Schist

It has visible grains but banding is absent. The rock has large, 12-sided garnets imbedded in it in a matrix form.

20. Basalt

Grains in this rock are not obvious; however, they are fine. The rock is dark gray-black in color. A person can only see very small crystals.

21. Obsidian

The rock is black in color. Also, it is glassy and lustrous.

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