A mineral breaks into flat sheets when struck with a rock hammer.

Which property of a mineral is being measured?

A.
hardness

B.
cleavage**

C.
streak

D.
color

Yeah its going to be (A hardness)

The property of a mineral that is being measured in this scenario is cleavage.

When a mineral breaks along flat planes or sheets, it is said to have cleavage. Cleavage is the tendency of a mineral to break along specific planes of weakness, resulting in flat, smooth surfaces. It is a property that depends on the internal structure of the mineral.

To determine the property of cleavage, you would need to examine the mineral's physical characteristics and test how it breaks. In this case, using a rock hammer to strike the mineral and observing it breaking into flat sheets indicates that it has cleavage.

Agree

it is A