Chemical formula: Si02 (Silica dioxide)
Crystal system: Trigonal
Hardness: 6.5- 7
Lustre: Vitreous 
Colour: Various colours that range from transparent to opaque which have irregular, sometimes circular bands of colour.
Sources: Most commonly found in metamorphic rock. Sources: Russia, Brazil, Egypt, Germany, India, Italy, Madagascar, Mexico, Uruguay, U.S.A.

Chemical formula: Si02 (Silica dioxide)
Crystal system: Trigonal
Hardness: 6.5-7
Lustre: Vitreous
Colour: Pale blue with white and/or darker lines
Sources: Same as agate
Potential Healing benefits: Blue lace agate has the potential to help clear the throat chakra and aid communication. Also good for the thyroid gland. Helps to cool down fevers.

Chemical formula: Si02
Crystal system: Trigonal
Hardness: 6.5-7
Lustre: opaque
Colour: Brownish red, orange, blue, green
Sources: Central Mexico, North Mexico, Arizona
Potential Healing benefits: Assists in sexual functioning/ relationships; potential to heal stomach problems and the endocrine system.

Associated Chakra: Base

Chemical formula: KAISi3O8 (Potassium Aluminium Silicate)
Crystal system: Triclinic
Hardness: 6-6.5
Lustre: vitreous
Colour: green/ blue green
Sources:  Amazonite is the rare green variety of Microcline. Microcline is a common potassium feldspar. Common sources are Colorado, Virginia, Brazil, India, Russia, and Madagascar.
Potential Healing benefits:  Amazonite aids communication and integrity. It aligns the physical and astral bodies. It can lessen stress and self-defeating behaviours by calming and building self-esteem. Amazonites can assist in healing emotional disturbances and the after effects of emotional trauma. It helps decrease heart problems, benefiting the muscles, helping the nervous system.

Associated Chakra: Heart and throat

Amber is a fossil resin, and is not to be classed amongst minerals. It is a vegetable fossil, which the Greeks called electron. It is composed of carbon, oxygen and hydrogen.
Chemical formula: K10H16O+H2S (similar to)
Crystal system: Amorphous
Hardness: 1-5
Lustre: resinous
Colour: yellow, yellow- brown
Sources: Britain, Poland, Italy, Romania, Russia, Germany, Myanmar, Dominica.
Potential Healing benefits: Mental stimulation and clarity, self confidence, ability to stand up for oneself and can assist in putting ideas into action without fear of judgement or criticism from others. Treats stomach ailments and strengthens mucous membranes.

Associated Chakra: Solar Plexus

Amethyst was believed by the Greeks to prevent drunkenness and sobered the mind.
Chemical formula: SiO2+Fe (Silica dioxide +iron)
Crystal system: Trigonal
Hardness: 7
Lustre: Vitreous
Colour: Violet
Sources: United States, Britain, Canada, Brazil, Mexico, Russia, Sri Lanka, Uruguay, East Africa, Siberia, India.
Potential Healing benefits: Amethyst relaxes the nervous system, assists healing of bone and joint ailments; eases convulsions and neuralgia. Emotionally this is a calming stone.

Associated Chakra: Amethyst has the potential to balance and align the chakras. It also is beneficial for the brow and crown chakra. Amethyst assists in opening the brow chakra to develop psychic abilities. When placed on the crown chakra, this area is calmed down, allowing spiritual enlightenment to develop.

Ametrine is a macrocrystaline variety of quartz where amethyst and citrine occur together. This occurs rarely in nature, and is artificially produced when amethyst is exposed to heat.  
Chemical formula: SiO2    
Crystal system: Hexagonal
Hardness:7
Lustre: Vitreous       
Colour: Yellow-orange and purple          
Sources: Natural source: Bolivia
Potential Healing benefits: Ametrine has both the healing properties of amethyst and citrine combined as well as making a good tool for meditation.

Associated Chakra: Crown chakra, brow, solar– plexus.

The name of Anhydrite was derived from a Greek word which means “without water”. This mineral is very brittle.
Chemical formula: CaSO4
Crystal system: Orthorhombic
Hardness: 3-3.5
Lustre: Vitreous, greasy, pearly
Colour: Colourless, violet, rose pink, brownish, reddish, grey.
Sources: Salt mines, Italy; Austria.
Potential Healing benefits: Assists with fluid retention;

Associated Chakra: Throat chakra.

Chemical formula: Be3Al2Si6O18
Crystal system: Hexagonal                       
Hardness: 7.5-8
Lustre:
Colour: Blue
Sources: United Sates, Mexico, Russia, Brazil, India, Ireland, Zimbabwe, Afghanistan, Pakistan.
Potential Healing benefits: A protective stone. Aquamarine assists in releasing negative belief patterns and guilt. Clarifies thought and aids positive communication on all levels. Physically helps swollen glands, throat problems, and eye disorders.

Chemical formula: Cu2Cl (OH) 3
Crystal system: Orthorhombic      
Hardness: 3-3 1/2
Lustre: Vitreous
Colour: Deep turquoise
Sources: United States, Australia, Mexico, Chile         
Potential Healing benefits: Assists in psychic abilities and opens spiritual awareness. Stimulates the thymus gland and helps proper functioning of the immune system.

Associated Chakra: brow, crown, heart

Chemical formula: SiO2
Crystal system: Trigonal
Hardness: 7
Lustre: Vitreous
Colour: Green, pink, blue
Sources: Brazil, Japan, India, Russia, USA, Tanzania.
Potential Healing benefits: Assists in clarity of thought, calms the mind and emotions, and alleviates stress. Opens and balances the heart chakra. Assists in respiratory problems, fevers, inflammation, normalises blood pressure.

Chemical formula: Cu3(CO3)2(OH)2
Crystal system: Monoclinic
Hardness: 3 ?-4
Lustre: Vitreous
Colour: Azure blue, dark blue, light blue.
Sources: France , Australia, United States. Russia, Egypt.
Potential Healing benefits: Assists in clarifying thoughts and releases negative thought patterns, allowing creativity to develop. Aids meditation and spiritual enlightenment. Opens the brow and crown chakra. Physically helps reduce swelling and inflammations.