Calcite
Calcite is available in several different colours which are as the result of different mineral elements which have been involved as the Calcite formed.
In general:
Calcite is for meditation and increasing psychic abilities; it assists with channelling, intuitive awareness, Shamanic work and astral travel during meditation.
It is helpful during those stressful and anxious times and emotional trauma; it helps to improve memory and concentration, stimulating the intellect, helping to organise thoughts and information, thereby increasing sense of self-worth.