card 4 DIORITE

Picture 1 shows a hand sample of diorite. The predominant minerals of diorite include sodium-rich plagioclase feldspar (light-colored) and amphibole (dark-colored). These minerals give diorite its characteristic salt-and-pepper appearance. Quartz and biotite mica are also possible constituent minerals. Enlarge the photo to see the minerals present in this specimen.

PICTURE Click once on the picture to enlarge it. Click on the "back" button to revert to normal size.

1

diorite handsample

---

CHOOSE YOUR NEXT IGNEOUS ROCK CARD

1. INTRODUCTION

2. INTRUSIVE IGNEOUS ROCKS

3. GRANITE

5. GABBRO

6. IGNEOUS INTRUSIONS

7. EXTRUSIVE IGNEOUS ROCKS

8. RHYOLITE

9. ANDESITE

10. BASALT

11. IGNEOUS ROCKS QUIZ