These articles are not a comprehensive guide but are a starting point.

AZURITE
Azurite

Hardness: 3.5-4 Chakra: Naval, Throat, Third-eye, Crown Azurite is most definitely a crystal of psychic awakening and development of intuition. Increasing the...

how-to-get-good-luck-with-aventurine
Aventurine

Hardness: 7 Chakra: Heart Aventurine will usually contain speckles of hematite, mica or other minerals which means the properties of those minerals...

aquamarine
Aquamarine

Hardness: 7.5-8 Chakra: Throat Aquamarine is a type of Beryl, increases intellectual activity, capacity and processes. Aquamarine aids clear communication and has...

Apophyllite
Apophyllite

Hardness: 4.5-5 Chakra: Third-eye, Crown and Green Apophyllite: Heart Apophyllite is a crystal of intuition and astral travel, providing for a clear...

Apatite

Hardness: 5 Chakra: Dependant upon colour as Apatite occurs in a range of colours Apatite can be used to bring balance to...

Anyolite (Ruby in Zoisite)

Being comprised of two distinctly different minerals I will show the hardness for each. Hardness Ruby: 9 Hardness Zoisite: 5.5 Chakra: Heart, Third-eye,...

Angelite
Angelite

Hardness: 3.5 Chakra: Throat Angelite is a stone of communication, with spirit guides, angels, other beings of higher frequencies and of you...

Amethyst
Amethyst

Hardness:7 Chakra: Crown, Third-eye Amethyst is a highly spiritual stone helping people access and remember many of our innate psychic abilities. Amethyst...

rough amber crystal
Amber

Hardness:2-2.5 Chakra: Solar Plexus, Crown Amber absorbs and transmutes negative energy, increases self-confidence and self-esteem and is an aid for manifestation.The rubbing...

Amazonite
Amazonite

Hardness:6-6.5 Chakra: All but particularly Heart, Throat Amazonite has an all round soothing energy, bringing peace to the emotions and helps to...