BACKGROUND:
Gems are attractive substances that people find
valuable. Many minerals are gems, such as diamonds, but not all gems are
minerals; amber is an example. Gems are "cut" into many different
geometric shapes. In this exercise, students will begin to look at geometric
shapes, and will also learn the differences between a gem and a mineral.
The world is three dimensional, but children usually
draw only in two dimensions. In this exercise students also will learn the
fundamentals of drawing basic threedimensional shapes.
PROCEDURE:

Students must know the key components of mineral shapes to be able to
distinguish and draw them. The chart below shows three basic geometric
shapes that are common in minerals. Draw and label each two dimensional
shape on the board, along with its threedimensional equivalent.
Demonstrate how to draw each object one at a time. Allow the students to
draw along with you. Drawing intermediate forms will help you instruct
the students on how to draw the shapes. Shading also helps students see
the shapes as threedimensional.