Color Is the most obvious but least dependable property. So come in one color. Other minerals have a wide variety calcite, which can be pink, orange, blue-green, red, bro Sometimes other elements can cause a change in color will have a different color if viewed under an ultraviole minerals are considered to be fluorescent. PHYSICAL PROPERITES OF MINERALS NOTES SEPT. 29, 2015 Streak The color of cursed mineral powder is known as t streak. A mineral is scraped across a streak plate it leaves. The color of a mineral’s powder streak i identifying minerals in two ways. The color of the different than the color of the element or nearly e streak color that stays the same regardless of the mineral. Streak plates Are small squared of white, unglazed porcelain. A streaks white or clear can’t be tested this way. Str useful in identifying dark-colored minerals. If a st available, a piece of fine sandpaper will work for t minerals. Hardness describes how a substance will resist being Hardness another substance. Moh’s Scale It is the standard scale for measuring the hardness of developed by Frederick Mohs in 1822. The scale rat through 10, with 1 being the softest and 10 being the different mineral is represented by each number, wit harder than the previous one. The scale is relative in measurement. A mineral can less than 4 in hardness. The hardness can be written or in half number increments for in between hardnes Luster The way it reflect light is called luster. It is used to d Cleavage Fracture mineral looks. It is impossible to identify minerals th luster on this characteristic alone. Some can have a m Non-metalic minerals are shiny but not as reflective that are not shiny are classed earthy or dull. Others m silky, pearly, and vitreous (glassy). A mineral’s lust to its chemical composition. Minerals are made of crystals, and when the cryst reveals a particular crystal shape. This shape is k If the mineral does not have any crystalized fragm not have cleavage. The way a mineral is broken. Different minerals b ways. Fracture can be used to describe the way a when it does not have cleavage.