Luster. Luster describes the reflection of light off a mineral’s surface. Mineralogists have special terms to describe luster.

Turning on the switch in a flash light starts a chemical reaction in the batteries. The chemical energy is turned to light energy and the flashlight lights up.

The battery has chemical energy. When the flashlight is turned on, the chemical energy is first transformed into electrical energy and then into light energy. CHEMICAL bonds. It is released during a chemical reaction (change).

Color. One of the most obvious properties of a mineral is color. Color should be considered when identifying a mineral, but should never be used as the major identifying characteristic.

Mineral like copper is used in electrical equipments as it is good electrical conductor. Clay is used to make cement etc which helps in constructing roads. Fibreglass, cleaning agents are made by borax.

Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton which had fallen to the sea floor.

Chalk forms from a fine-grained marine sediment known as ooze. When foraminifera, marine algae, or other organisms living on the bottom or in the waters above die, their remains sink to the bottom and accumulate as ooze. Extensive deposits of chalk are found in many parts of the world.

Chalk, in both its natural and man-made form, is white in colour and is considered to be a fairly soft solid. Naturally, It comes from the ground where it is found as a porous (can hold water) sedimentary rock. Most people associate chalk as being white, however red chalk also occurs naturally.

Especially for people with lung issues, inhaling chalk dust with lots of drying agents can cause dehydration on the lung surfaces and lead to shortness of breath, coughing, and wheezing. Chalk dust inhalation isn’t the only risk; this substance can also affect your skin negatively.

Chalk, soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest varieties contain up to 99 percent calcium carbonate in the form of the mineral calcite.

The cliffs are made from chalk, a soft white, very finely grained pure limestone, and are commonly 300-400m deep. The chalk layers built up gradually over millions of years. The resulting edge of chalk is the iconic White Cliffs of Dover.

The White Cliffs are hugely iconic in Britain – and for the most part, that’s due to their place in military history. They sit across the narrowest part of the Channel, facing towards continental Europe at its closest point to Britain and forming a symbolic guard against invasion.