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Twin Crystals

Twinning: The symmetrical intergrowth of two or more individual crystals are known as the ”twin crystals”. In a twinned crystal the lattice directions of one unit exhibit a definite crystallographic relation to the lattice directions of the other. Twin Plane: This plane exists between two twinned crystals. The twin plane divides the two twinned crystals …

Crystal Groups

Apart from the crystal system, crystals are also found in groups. There are three main crystal groups; (i) Crystal Aggregated, (ii) Parallel Growth, and (iii) Twin Crystals. (1). Crystal Aggregates: The groups of associated crystals are found as ”crystal aggregates”. If the crystals forming the aggregate are made of one mineral only, the aggregate is …