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Hardness is usually measured on Mohs hardness scale. The scale is measured from one to ten, with one being the softest and 10 being the hardness . All kinds of quartz have a hardness of seven. Because citrine is in the quartz family, it has a hardness of seven.Minerals that break along smooth flat surfaces have cleavage. Cleavage is determined by the arrangement of mineral's atoms . Citrine has no cleavage, therefore it has fracture. Minerals that break with rough or jagged edges have fracture. Citrine has fracture because it has no cleavage.The color of a mineral when it is broken up and powdered is called streak . The streak of citrine is white.
Luster describes how light is reflected from a mineral's surface.The luster of citrine is vitreous, or closely resembles glass .Citrine is found in most places but most miners and manufacturers go to Brazil to find it because of the quality and availability there.Citrine is mostly used for jewelry but is also found in voltage devices for radios.Citrine is also used a lot as a substitute for yellow sapphire and yellow diamond. Minerals are found in many kinds of rocks. In this next section, you will learn how minerals make up rocks, and how rocks are