Explanation: The behaviour of a mineral towards the forces that tend to break, bend, cut or crush is described by the term tenacity. Thus, when a mineral can be cut with a knife, it is described as sectile.

Explanation: Some minerals are not only flexible but elastic, that is, they regain their shape when the force applied on them is removed. Micas are the best example. Hence they are both flexible and elastic.

Explanation: The mineral occurs in the form of a flattened, square, rectangular or rhombohedral shape if it is said to be tabular. In other words, flattening is conspicuous compared to lengthwise elongation.

Explanation: When the mineral is in the form of a thin or thick elongated, column-like crystals, it is said to be elongated. For example, Beryl.

Explanation: The mineral appears as if composed of thin, flat, blade-like overlapping or juxtaposed parts, if it said to be bladed. Example: Kyanite.

Explanation: The mineral is made up of relatively thick, flexible, leaf-like sheets, if it is said to be lamellar. Example: Vermiculite.

Explanation: The foliated structure is similar to lamellar in broader sense but in this case, the individual sheets are paper thin, even thinner and can be easily separated. Example: Muscovite mica.

Explanation: The mineral is made up of needle like or fibrous crystals which appear originating from a common point thereby giving a radiating appearance, if it is said to be radiating. Example: Iron pyrites.

Explanation: The mineral occurs in the form of densely packed mass of small garin-like crystals, in the case of globular structure. Example: Chromite.

Explanation: Reniform is similar to globular but the shape of the bulbs or projections resembles to human kidneys. Example: Hematite.

Explanation: Mammillary is similar to globular but the projections are conspicuous in size, overlapping in arrangement and rounded in shape, best example is malachite.

Explanation: Specific gravity is the ratio between the density of a mineral and that of water at 4° Celsius. Since it is a ratio, it has no units.