Question 1
Which of the following describes the light reflecting and transmission characteristics of a mineral?
◦ color streak
◦ virtual absorption
◦ fluorescence
◦ luster
Question 2
When a mineral fractures along a cleavage plane, what does this suggest about the crystal structure of the mineral?
◦ The crystal contains warped planes called twin planes that weaken the crystal structure and allow it fracture along a planar surface, causing cleavage.
◦ The crystal structure contains planes along which chemical bonding is much weaker than other directions.
◦ The atoms are arranged in a simple orderly arrangement with uniform bonding.
◦ The crystal grows only planar faces that become weak zones that form cleavage.
Eudicot leaf development and structure.
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