Calcite

Calcite is a powerful amplifier and cleanser of energy. Simply having calcite in the room will cleanse any negative energy.
Calcite cleans the elimination organs such as bladder, bowel, kidneys. 
It helps in the absorption of calcium, dissolves calcification that builds up on broken bones and from arthritis and will help strengthen the skeleton and joints.
Calcite helps to bring hope and motivation into your life. It combats laziness helping you to become more energetic on all levels. Easing emotional stress and replacing it with serenity. 
A stabilising stone, it increases trust your ability to trust in yourself and others. It helps you overcome setbacks that you may encounter on you path.
Calcite calms the mind and teaches you how to analyse a situation and it stimulates your ability to have insight into a situation, it also boosts your memory. It helps you to know instinctively which information is important to you at that moment and will give you the ability to change an idea into action. 
It is a spiritual stone linked to the higher consciousness that helps to open your higher awareness and psychic abilities. It increases spiritual development and allows the soul to remember.
Orange Calcite is best known as the stone of creativity. It is strongly connected to the lower chakras, especially the Sacral chakra, which is the seat of joy, creativity, and pleasure.
Blue Calcite has many beneficial effects for anyone who suffers from anxiety or depression. Blue Calcites powerful blue rays soothe and relax nerves. It’s calming effects on the mind allow the user to think about emotional situations with more of a level head. 
Green Calcite brings a renewed sense of purpose and vitality and a desire to make positive change in ones life. It encourages forgiveness of oneself and others and brings softness to the heart, stimulating compassion.
Pink Calcite helps develop deep, genuine compassion for yourself. It helps you overcome self-criticism and self-blame. If you feel that you are your own worst critic, never do anything “right,” or aren’t meeting your own expectations dissolving and releasing those feelings that cause you to “beat yourself up.” This stone helps you to be gentler to yourself and learn to be your own best friend.
Brown Calcite protects the user from negative energy and brings about a sense of peace. It is also used as a prosperity stone. Calcite is also known as the "stone of the mind”. Calcite heightens mental discernment and analysis, increases memory and learning abilities.