Minerals in geodes (as seen below)form spectacular euhedral crystals because
A) all of the elements incorporated in the crystals are in plentiful supply.
B) the crystals have abundant room to grow in their hollow surroundings.
C) minerals within geodes are always framework silicates.
D) minerals within geodes always contain iron.

Question

Minerals in geodes (as seen below)form spectacular euhedral crystals because 
A) all of the elements incorporated in the crystals are in plentiful supply. 
B) the crystals have abundant room to grow in their hollow surroundings. 
C) minerals within geodes are always framework silicates. 
D) minerals within geodes always contain iron.

Quizplus · Accepted Answer

Geodes are hollow cavities within rocks that are lined with mineral crystals. As the crystals grow, they have abundant space within the cavity to develop their geometric shape and form euhedral crystals. This allows the crystals to develop with well-defined faces and sharp edges, creating the spectacular display seen in geodes. The formation of crystals is not dependent on the abundance of elements or the presence of iron, so options A and D can be ruled out. Option C is also not true, as minerals within geodes can be a variety of types, not just framework silicates.

Minerals in Geodes (As Seen Below)form Spectacular Euhedral Crystals Because