Quartz

The large family of quartz is divided into two groups: macrocrystallized quartz and microcrystallized quartz.

Names of the various quartz according to their color:

• The rock crystal is colorless
• Amethyst is violet. Until the 18th century, it was considered a precious stone in the same way as diamond, ruby, emerald or sapphire.
• Citrine is yellow
• Prasiolite is green, its color is often obtained by heat treatment of an amethyst
• Smoky quartz is brown
• Morion is black
• Rose quartz is pink of course.
• There is also ametrine, a famous stone known for its bicolor aspect: yellow and purple. The most beautiful and most prized are those from Bolivia.
• The different quartz inclusions:
• The quartz hair of Venus: Inclusions of golden rutile needles.
• The quartz arrows of love: inclusions of black tourmaline
• The green aventurine: inclusions of fuchsite.
• The blue aventurine: inclusions of dumortierite 
• The brown aventurine: inclusions of hematite
• Falcon's eye: inclusions of blue crocidolite (non-oxidized crocidolite) Crocidolite corresponds to asbestos.
• Tiger's eye: inclusions of golden crocidolite (crocidolite in the process of oxidation)
• Bull's eye: inclusions of reddish crocidolite (oxidized crocidolite)
• The eye of iron: inclusions of crocidolite

And microcrystalline quartz :

• Blue-grey chalcedony
• Orange carnelian
• Moss agate
• Agate, used for cameos
• Chrysoprase
• Jasper
• Blood jasper
• Heliotrope
• Onyx